作者单位:
Department of Epidemiology and Biostatistics, Drexel UniversityPhiladelphia, PA, United States
[1]
Department of Orthopaedic Surgery, St Christopher's Hospital for ChildrenPhiladelphia, PA, United
[2]
Department of Orthopaedic Surgery, Drexel University, College of Medicine, 245 N 15th
[3]
发布时间
2014-11-28