1. Department of Pediatric Orthopedics, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning, P.R. China
2. Department of Nursing, Jinzhou Medical University, Jinzhou 121001, Liaoning, P.R. China
3. Department of Pediatric Orthopedic Surgery, Lille University Centre, Jeanne de Flandre Hospital, Lille 59000, Nord Department, France