Chuang Qiu1, Qi-Wei Li2, Lu Zhang3, Xiao-Liang Liu4. 1. Department of Orthopaedics, Shengjing Hospital of China Medical University, Shenyang, China. 2. Department of Pediatric Orthopaedics, Shengjing Hospital of China Medical University, Shenyang, China. 3. Department of Clinical Genetics, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Shenyang, 110004, China. 4. Department of Clinical Genetics, Shengjing Hospital of China Medical University, No. 36 Sanhao Street, Shenyang, 110004, China. liuxl@sj-hospital.org.