^aDepartment of Orthopaedic Surgery, Fuzhou General Hospital of PLA, Fuzhou, Fujian

^bDepartment of Pediatric Orthopaedics, Xin-Hua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai

^cThe Third Department of Orthopedics, The First Affiliated Hospital of Harbin Medical University, Harbin, China

^dNational Taiwan University Hospital, Taipei Medical University, Taipei, Taiwan (ROC)

Correspondence to Li Zhao, MD, PhD, Department of Pediatric Orthopaedics, Xin-Hua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, No. 1665, Kongjiang Road, Shanghai 200092, China Tel: +86 021 250 789 99 x8470; fax: +86 216 503 8040; e-mail: [email protected]