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Robert M Kay, MD

TitleProfessor of Orthopaedic Surgery (Clinical Scholar)
InstitutionUniversity of Southern California
DepartmentPediatric Orthopaedic Surgery
AddressCHL Mail Stop 69
Off Campus
Los Angeles CA 90089
Phone+1 323 361 4658
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    Dr. Kay received his undergraduate degree from Harvard College and his medical degree from The Johns Hopkins University School of Medicine. He completed his residency in orthopaedic surgery at University of California Los Angeles and a fellowship in pediatric orthopaedics at Atlanta Scottish Rite Childrens Medical Center. Dr. Kay has published over 70 peer-reviewed articles and numerous book chapters and is active in several organizations including the American Academy of Orthopaedic Surgeons, Pediatric Orthopaedic Society of North America, American Academy of Cerebral Palsy and Developmental Medicine and the Gait and Clinical Movement Analysis Society. Dr. Kay has been the director of the Motion Analysis Laboratory since 1997.


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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help.
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    1. Murgai RR, Compton E, Patel AR, Ryan D, Kay R. Foam Padding in Postoperative Lower Extremity Casting: An Inexpensive Way to Protect Patients. J Pediatr Orthop. 2018 Jun 20. PMID: 29927792.
      View in: PubMed
    2. Sousa TC, Nazareth A, Rethlefsen SA, Mueske NM, Wren TA, Kay R. Rectus Femoris Transfer Surgery Worsens Crouch Gait in Children With Cerebral Palsy at GMFCS Levels III and IV. J Pediatr Orthop. 2017 Apr 03. PMID: 28375967.
      View in: PubMed
    3. Nazareth A, Rethlefsen S, Sousa TC, Mueske NM, Wren TA, Kay R. Percutaneous Hamstring Lengthening Surgery is as Effective as Open Lengthening in Children With Cerebral Palsy. J Pediatr Orthop. 2016 Dec 22. PMID: 28009799.
      View in: PubMed
    4. Rethlefsen SA, Blumstein G, Kay R, Dorey F, Wren TA. Prevalence of specific gait abnormalities in children with cerebral palsy revisited: influence of age, prior surgery, and Gross Motor Function Classification System level. Dev Med Child Neurol. 2017 01; 59(1):79-88. PMID: 27421715.
      View in: PubMed
    5. Seehausen DA, Harris LR, Kay R, Pace JL. Accessory Navicular is Associated With Wider and More Prominent Navicular Bone in Pediatric Patients by Radiographic Measurement. J Pediatr Orthop. 2016 Jul-Aug; 36(5):521-5. PMID: 25887831.
      View in: PubMed
    6. Ryan DD, Lightdale-Miric NR, Joiner ER, Wren TA, Spragg L, Heffernan MJ, Kay R, Skaggs DL. Variability of the Anterior Humeral Line in Normal Pediatric Elbows. J Pediatr Orthop. 2016 Mar; 36(2):e14-6. PMID: 26035494.
      View in: PubMed
    7. Kay R, Rethlefsen SA. Anterior Percutaneous Hemiepiphysiodesis of the Distal Aspect of the Femur: A New Technique: A Case Report. JBJS Case Connect. 2015 Oct-Dec; 5(4):e95. PMID: 29252801.
      View in: PubMed
    8. Rethlefsen SA, Nguyen DT, Wren TA, Milewski MD, Kay R. Knee Pain and Patellofemoral Symptoms in Patients With Cerebral Palsy. J Pediatr Orthop. 2015 Jul-Aug; 35(5):519-22. PMID: 25171680.
      View in: PubMed
    9. Yu S, Rethlefsen SA, Wren TA, Kay R. Long-term ambulatory change after lower extremity orthopaedic surgery in children with cerebral palsy: a retrospective review. J Pediatr Orthop. 2015 Apr-May; 35(3):285-9. PMID: 24978124.
      View in: PubMed
    10. Seehausen DA, Kay R, Ryan DD, Skaggs DL. Foam padding in casts accommodates soft tissue swelling and provides circumferential strength after fixation of supracondylar humerus fractures. J Pediatr Orthop. 2015 Jan; 35(1):24-7. PMID: 25489945.
      View in: PubMed
    11. Ramirez RN, Ryan DD, Williams J, Wren TA, Ibrahim D, Weiss JM, Kay R, Lightdale-Miric N, Skaggs DL. A line drawn along the radial shaft misses the capitellum in 16% of radiographs of normal elbows. J Pediatr Orthop. 2014 Dec; 34(8):763-7. PMID: 24787305.
      View in: PubMed
    12. Lee C, Lightdale-Miric N, Chang E, Kay R. Silent compartment syndrome in children: a report of five cases. J Pediatr Orthop B. 2014 Sep; 23(5):467-71. PMID: 24921836.
      View in: PubMed
    13. Arkader A, Rethlefsen SA, Kay R. Heterotopic Ossification Excision Improves Kinetic and Kinematic Gait Parameters as Demonstrated by Computerized Motion Analysis: A Case Report. JBJS Case Connect. 2013 Nov 13; 3(4 Suppl 3):1-7. PMID: 29252272.
      View in: PubMed
    14. Arkader A, Rethlefsen SA, Kay R. Heterotopic Ossification Excision Improves Kinetic and Kinematic Gait Parameters as Demonstrated by Computerized Motion Analysis: A Case Report. JBJS Case Connect. 2013 Oct 23; 3(4 Suppl 2):e1051-7. PMID: 29252260.
      View in: PubMed
    15. Rethlefsen SA, Yasmeh S, Wren TA, Kay R. Repeat hamstring lengthening for crouch gait in children with cerebral palsy. J Pediatr Orthop. 2013 Jul-Aug; 33(5):501-4. PMID: 23752146.
      View in: PubMed
    16. Wren TA, Lening C, Rethlefsen SA, Kay R. Impact of gait analysis on correction of excessive hip internal rotation in ambulatory children with cerebral palsy: a randomized controlled trial. Dev Med Child Neurol. 2013 Oct; 55(10):919-25. PMID: 23738949.
      View in: PubMed
    17. Rethlefsen SA, Kay R. Transverse plane gait problems in children with cerebral palsy. J Pediatr Orthop. 2013 Jun; 33(4):422-30. PMID: 23653033.
      View in: PubMed
    18. Wren TA, Otsuka NY, Bowen RE, Scaduto AA, Chan LS, Dennis SW, Rethlefsen SA, Healy BS, Hara R, Sheng M, Kay R. Outcomes of lower extremity orthopedic surgery in ambulatory children with cerebral palsy with and without gait analysis: results of a randomized controlled trial. Gait Posture. 2013 Jun; 38(2):236-41. PMID: 23219787.
      View in: PubMed
    19. Wren TA, Elihu KJ, Mansour S, Rethlefsen SA, Ryan DD, Smith ML, Kay R. Differences in implementation of gait analysis recommendations based on affiliation with a gait laboratory. Gait Posture. 2013 Feb; 37(2):206-9. PMID: 22871237.
      View in: PubMed
    20. Huh K, Rethlefsen SA, Wren TA, Kay R. Surgical management of hip subluxation and dislocation in children with cerebral palsy: isolated VDRO or combined surgery? J Pediatr Orthop. 2011 Dec; 31(8):858-63. PMID: 22101664.
      View in: PubMed
    21. Kay R, Leathers M, Directo MP, Myung K, Skaggs DL. Perioperative ketorolac use in children undergoing lower extremity osteotomies. J Pediatr Orthop. 2011 Oct-Nov; 31(7):783-6. PMID: 21926877.
      View in: PubMed
    22. Sabatini CS, Skaggs KF, Kay R, Skaggs DL. Orthopedic surgeons are less likely to see children now for fracture care compared with 10 years ago. J Pediatr. 2012 Mar; 160(3):505-7. PMID: 21920543.
      View in: PubMed
    23. Aisen ML, Kerkovich D, Mast J, Mulroy S, Wren TA, Kay R, Rethlefsen SA. Cerebral palsy: clinical care and neurological rehabilitation. Lancet Neurol. 2011 Sep; 10(9):844-52. PMID: 21849165.
      View in: PubMed
    24. Wren TA, Otsuka NY, Bowen RE, Scaduto AA, Chan LS, Sheng M, Hara R, Kay R. Influence of gait analysis on decision-making for lower extremity orthopaedic surgery: Baseline data from a randomized controlled trial. Gait Posture. 2011 Jul; 34(3):364-9. PMID: 21723131.
      View in: PubMed
    25. Skaggs DL, Glassman D, Weiss JM, Kay R. A new surgical technique for the treatment of supracondylar humerus fracture malunions in children. J Child Orthop. 2011 Aug; 5(4):305-12. PMID: 22852037; PMCID: PMC3234893.
    26. Ryan DD, Kay R. Orthopaedic issues in children and adolescents with central nervous system tumors. J Pediatr Rehabil Med. 2011; 4(1):71-8. PMID: 21757812.
      View in: PubMed
    27. Al Wren T, Lee DC, Kay R, Dorey FJ, Gilsanz V. Bone density and size in ambulatory children with cerebral palsy. Dev Med Child Neurol. 2011 Feb; 53(2):137-41. PMID: 21166671; PMCID: PMC3064513.
    28. Kay R, Directo MP, Leathers M, Myung K, Skaggs DL. Complications of ketorolac use in children undergoing operative fracture care. J Pediatr Orthop. 2010 Oct-Nov; 30(7):655-8. PMID: 20864848.
      View in: PubMed
    29. Wren TA, Lee DC, Hara R, Rethlefsen SA, Kay R, Dorey FJ, Gilsanz V. Effect of high-frequency, low-magnitude vibration on bone and muscle in children with cerebral palsy. J Pediatr Orthop. 2010 Oct-Nov; 30(7):732-8. PMID: 20864862; PMCID: PMC2946103.
    30. Rethlefsen SA, Ryan DD, Kay R. Classification systems in cerebral palsy. Orthop Clin North Am. 2010 Oct; 41(4):457-67. PMID: 20868878.
      View in: PubMed
    31. Rethlefsen SA, Lening C, Wren TA, Kay R. Excessive hip flexion during gait in patients with static encephalopathy: an examination of contributing factors. J Pediatr Orthop. 2010 Sep; 30(6):562-7. PMID: 20733421.
      View in: PubMed
    32. Wren TA, Cheatwood AP, Rethlefsen SA, Hara R, Perez FJ, Kay R. Achilles tendon length and medial gastrocnemius architecture in children with cerebral palsy and equinus gait. J Pediatr Orthop. 2010 Jul-Aug; 30(5):479-84. PMID: 20574267.
      View in: PubMed
    33. Huh K, Rethlefsen SA, Wren TA, Kay R. Development of calcaneal gait without prior triceps surae lengthening: an examination of predictive factors. J Pediatr Orthop. 2010 Apr-May; 30(3):240-3. PMID: 20357589.
      View in: PubMed
    34. Bernthal NM, Gamradt SC, Kay R, Wren TA, Cuomo AV, Reid J, Bales J, Otsuka NY. Static and dynamic gait parameters before and after multilevel soft tissue surgery in ambulating children with cerebral palsy. J Pediatr Orthop. 2010 Mar; 30(2):174-9. PMID: 20179566.
      View in: PubMed
    35. Weiss JM, Kay R, Waters P, Yang S, Skaggs DL. Distal humerus osteotomy for supracondylar fracture malunion in children: a study of perioperative complications. Am J Orthop (Belle Mead NJ). 2010 Jan; 39(1):22-5. PMID: 20305836.
      View in: PubMed
    36. Karlen JW, Skaggs DL, Ramachandran M, Kay R. The Dega osteotomy: a versatile osteotomy in the treatment of developmental and neuromuscular hip pathology. J Pediatr Orthop. 2009 Oct-Nov; 29(7):676-82. PMID: 20104144.
      View in: PubMed
    37. Wren TA, Kalisvaart MM, Ghatan CE, Rethlefsen SA, Hara R, Sheng M, Chan LS, Kay R. Effects of preoperative gait analysis on costs and amount of surgery. J Pediatr Orthop. 2009 Sep; 29(6):558-63. PMID: 19700983.
      View in: PubMed
    38. Weiss JM, Graves S, Yang S, Mendelsohn E, Kay R, Skaggs DL. A new classification system predictive of complications in surgically treated pediatric humeral lateral condyle fractures. J Pediatr Orthop. 2009 Sep; 29(6):602-5. PMID: 19700990.
      View in: PubMed
    39. Ogawa BK, Skaggs DL, Kay R. Malignant peripheral nerve sheath tumor of the lumbar spine. Am J Orthop (Belle Mead NJ). 2009 May; 38(5):E89-92. PMID: 19585001.
      View in: PubMed
    40. Rethlefsen SA, Kam G, Wren TA, Kay R. Predictors of outcome of distal rectus femoris transfer surgery in ambulatory children with cerebral palsy. J Pediatr Orthop B. 2009 Mar; 18(2):58-62. PMID: 19282786.
      View in: PubMed
    41. Sankar WN, Rethlefsen SA, Weiss J, Kay R. The recurrent clubfoot: can gait analysis help us make better preoperative decisions? Clin Orthop Relat Res. 2009 May; 467(5):1214-22. PMID: 19093158; PMCID: PMC2664418.
    42. Weiss JM, Choi P, Ghatan C, Skaggs DL, Kay R. Complications with flexible nailing of femur fractures more than double with child obesity and weight >50 kg. J Child Orthop. 2009 Feb; 3(1):53-8. PMID: 19308613; PMCID: PMC2656847.
    43. Wood HM, Kay R, Angermeier KW, Ross JH. Timing of the presentation of urethrocutaneous fistulas after hypospadias repair in pediatric patients. J Urol. 2008 Oct; 180(4 Suppl):1753-6. PMID: 18721981.
      View in: PubMed
    44. Sankar WN, Chen J, Kay R, Skaggs DL. Incidence of occult fracture in children with acute ankle injuries. J Pediatr Orthop. 2008 Jul-Aug; 28(5):500-1. PMID: 18580361.
      View in: PubMed
    45. Rethlefsen SA, Kay R. "Kinematic and kinetic evaluation of the ankle joint before and after tendo Achilles lengthening in patients with spastic diplegia". J Pediatr Orthop. 2008 Apr-May; 28(3):392. PMID: 18362810.
      View in: PubMed
    46. Wren TA, Sheng M, Bowen RE, Scaduto AA, Kay R, Otsuka NY, Hara R, Chan LS. Concurrent and discriminant validity of Spanish language instruments for measuring functional health status. J Pediatr Orthop. 2008 Mar; 28(2):199-212. PMID: 18388716.
      View in: PubMed
    47. Skaggs DL, Sankar WN, Albrektson J, Vaishnav S, Choi PD, Kay R. How safe is the operative treatment of Gartland type 2 supracondylar humerus fractures in children? J Pediatr Orthop. 2008 Mar; 28(2):139-41. PMID: 18388704.
      View in: PubMed
    48. Albrektson J, Kay R, Tolo VT, Skaggs DL. Abduction pillow immobilization following hip surgery: a welcome alternative for selected patients. J Child Orthop. 2007 Nov; 1(5):299-305. PMID: 19308524; PMCID: PMC2656736.
    49. Wren TA, Do KP, Hara R, Dorey FJ, Kay R, Otsuka NY. Gillette Gait Index as a gait analysis summary measure: comparison with qualitative visual assessments of overall gait. J Pediatr Orthop. 2007 Oct-Nov; 27(7):765-8. PMID: 17878782.
      View in: PubMed
    50. Choi PD, Rose RK, Kay R, Skaggs DL. Compartment syndrome of the thigh in an infant: a case report. J Orthop Trauma. 2007 Sep; 21(8):587-90. PMID: 17805028.
      View in: PubMed
    51. Wren TA, Sheng M, Hara R, Otsuka NY, Bowen RE, Scaduto AA, Kay R, Chan LS. Agreement among three instruments for measuring functional health status and quality of life in pediatric orthopaedics. J Pediatr Orthop. 2007 Mar; 27(2):233-40. PMID: 17314653.
      View in: PubMed
    52. Ramachandran M, Kay R, Skaggs DL. Treatment of hip dislocation in Kabuki syndrome: a report of three hips in two patients. J Pediatr Orthop. 2007 Jan-Feb; 27(1):37-40. PMID: 17195795.
      View in: PubMed
    53. Skaggs DL, Oda JE, Lerman L, McGoldrick E, Rice C, Weiss J, Kay R. Insurance status and delay in orthotic treatment in children. J Pediatr Orthop. 2007 Jan-Feb; 27(1):94-7. PMID: 17195805.
      View in: PubMed
    54. Rethlefsen SA, Healy BS, Wren TA, Skaggs DL, Kay R. Causes of intoeing gait in children with cerebral palsy. J Bone Joint Surg Am. 2006 Oct; 88(10):2175-80. PMID: 17015594.
      View in: PubMed
    55. Michlitsch MG, Rethlefsen SA, Kay R. The contributions of anterior and posterior tibialis dysfunction to varus foot deformity in patients with cerebral palsy. J Bone Joint Surg Am. 2006 Aug; 88(8):1764-8. PMID: 16882899.
      View in: PubMed
    56. Ho CA, Skaggs DL, Tang CW, Kay R. Use of flexible intramedullary nails in pediatric femur fractures. J Pediatr Orthop. 2006 Jul-Aug; 26(4):497-504. PMID: 16791069.
      View in: PubMed
    57. Skaggs DL, Lehmann CL, Rice C, Killelea BK, Bauer RM, Kay R, Vitale MG. Access to orthopaedic care for children with medicaid versus private insurance: results of a national survey. J Pediatr Orthop. 2006 May-Jun; 26(3):400-4. PMID: 16670556.
      View in: PubMed
    58. Skaggs DL, Early SD, D'Ambra P, Tolo VT, Kay R. Back pain and backpacks in school children. J Pediatr Orthop. 2006 May-Jun; 26(3):358-63. PMID: 16670549.
      View in: PubMed
    59. Kay R, Skaggs DL. Pediatric polytrauma management. J Pediatr Orthop. 2006 Mar-Apr; 26(2):268-77. PMID: 16557148.
      View in: PubMed
    60. Stewart DG, Kay R, Skaggs DL. Open fractures in children. Principles of evaluation and management. J Bone Joint Surg Am. 2005 Dec; 87(12):2784-98. PMID: 16322632.
      View in: PubMed
    61. Wren TA, Rethlefsen SA, Healy BS, Do KP, Dennis SW, Kay R. Reliability and validity of visual assessments of gait using a modified physician rating scale for crouch and foot contact. J Pediatr Orthop. 2005 Sep-Oct; 25(5):646-50. PMID: 16199948.
      View in: PubMed
    62. Wren TA, Woolf K, Kay R. How closely do surgeons follow gait analysis recommendations and why? J Pediatr Orthop B. 2005 May; 14(3):202-5. PMID: 15812293.
      View in: PubMed
    63. Ryan DD, Rethlefsen SA, Skaggs DL, Kay R. Results of tibial rotational osteotomy without concomitant fibular osteotomy in children with cerebral palsy. J Pediatr Orthop. 2005 Jan-Feb; 25(1):84-8. PMID: 15614066.
      View in: PubMed
    64. Skaggs DL, Friend L, Alman B, Chambers HG, Schmitz M, Leake B, Kay R, Flynn JM. The effect of surgical delay on acute infection following 554 open fractures in children. J Bone Joint Surg Am. 2005 Jan; 87(1):8-12. PMID: 15634809.
      View in: PubMed
    65. Wren TA, Rethlefsen S, Kay R. Prevalence of specific gait abnormalities in children with cerebral palsy: influence of cerebral palsy subtype, age, and previous surgery. J Pediatr Orthop. 2005 Jan-Feb; 25(1):79-83. PMID: 15614065.
      View in: PubMed
    66. Kay R, Rethlefsen SA, Fern-Buneo A, Wren TA, Skaggs DL. Botulinum toxin as an adjunct to serial casting treatment in children with cerebral palsy. J Bone Joint Surg Am. 2004 Nov; 86-A(11):2377-84. PMID: 15523006.
      View in: PubMed
    67. Wren TA, Do KP, Kay R. Gastrocnemius and soleus lengths in cerebral palsy equinus gait--differences between children with and without static contracture and effects of gastrocnemius recession. J Biomech. 2004 Sep; 37(9):1321-7. PMID: 15275839.
      View in: PubMed
    68. Gupta N, Kay R, Leitch K, Femino JD, Tolo VT, Skaggs DL. Effect of surgical delay on perioperative complications and need for open reduction in supracondylar humerus fractures in children. J Pediatr Orthop. 2004 May-Jun; 24(3):245-8. PMID: 15105716.
      View in: PubMed
    69. Kay R, Rethlefsen S, Reed M, Do KP, Skaggs DL, Wren TA. Changes in pelvic rotation after soft tissue and bony surgery in ambulatory children with cerebral palsy. J Pediatr Orthop. 2004 May-Jun; 24(3):278-82. PMID: 15105723.
      View in: PubMed
    70. Skaggs DL, Cluck MW, Mostofi A, Flynn JM, Kay R. Lateral-entry pin fixation in the management of supracondylar fractures in children. J Bone Joint Surg Am. 2004 Apr; 86-A(4):702-7. PMID: 15069133.
      View in: PubMed
    71. Kay R, Rethlefsen SA, Ryan JA, Wren TA. Outcome of gastrocnemius recession and tendo-achilles lengthening in ambulatory children with cerebral palsy. J Pediatr Orthop B. 2004 Mar; 13(2):92-8. PMID: 15076586.
      View in: PubMed
    72. Kay R, Rethlefsen SA, Kelly JP, Wren TA. Predictive value of the Duncan-Ely test in distal rectus femoris transfer. J Pediatr Orthop. 2004 Jan-Feb; 24(1):59-62. PMID: 14676535.
      View in: PubMed
    73. Kay R, Khounganian GS, Stevanovic M. Late extensor pollicis longus rupture following displaced distal radius and ulna fractures in a child. J Orthop Trauma. 2004 Jan; 18(1):53-6. PMID: 14676559.
      View in: PubMed
    74. Early SD, Kay R, Tolo VT. Childhood diskitis. J Am Acad Orthop Surg. 2003 Nov-Dec; 11(6):413-20. PMID: 14686826.
      View in: PubMed
    75. Early SD, Kay R, Maguire MF, Skaggs DL. Delayed neurologic injury due to bone graft migration into the spinal canal following scoliosis surgery. Orthopedics. 2003 May; 26(5):515-6. PMID: 12755218.
      View in: PubMed
    76. Kay R, Rethlefsen SA, Hale JM, Skaggs DL, Tolo VT. Comparison of proximal and distal rotational femoral osteotomy in children with cerebral palsy. J Pediatr Orthop. 2003 Mar-Apr; 23(2):150-4. PMID: 12604941.
      View in: PubMed
    77. Flynn JM, Skaggs DL, Sponseller PD, Ganley TJ, Kay R, Leitch KK. The surgical management of pediatric fractures of the lower extremity. Instr Course Lect. 2003; 52:647-59. PMID: 12690889.
      View in: PubMed
    78. Skaggs DL, Kay R, Tolo VT. Fracture stability after pinning of displaced supracondylar distal humerus fractures in children. J Pediatr Orthop. 2002 Sep-Oct; 22(5):697; author reply 697-8. PMID: 12198477.
      View in: PubMed
    79. Kay R, Rethlefsen SA, Skaggs D, Leet A. Outcome of medial versus combined medial and lateral hamstring lengthening surgery in cerebral palsy. J Pediatr Orthop. 2002 Mar-Apr; 22(2):169-72. PMID: 11856923.
      View in: PubMed
    80. Skaggs DL, Roy AK, Vitale MG, Pfiefer C, Baird G, Femino D, Kay R. Quality of evaluation and management of children requiring timely orthopaedic surgery before admission to a tertiary pediatric facility. J Pediatr Orthop. 2002 Mar-Apr; 22(2):265-7. PMID: 11856944.
      View in: PubMed
    81. Tang CW, Kay R, Skaggs DL. Growth arrest of the distal radius following a metaphyseal fracture: case report and review of the literature. J Pediatr Orthop B. 2002 Jan; 11(1):89-92. PMID: 11866089.
      View in: PubMed
    82. Kay R, Jaki KA, Skaggs DL. The effect of femoral rotation on the projected femoral neck-shaft angle. J Pediatr Orthop. 2000 Nov-Dec; 20(6):736-9. PMID: 11097245.
      View in: PubMed
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