1. Medical College of Soochow University, Suzhou, Jiangsu 215123, P.R. China
2. Department of Endocrinology, Punan Hospital of Pudong New District, Shanghai 200125, P.R. China
3. Metabolic Bone Disease and Genetic Research Unit, Department of Osteoporosis and Bone Diseases, Shanghai Key Clinical Center for Metabolic Disease, Sixth People's Hospital Affiliated to Shanghai Jiao Tong University, Shanghai 200233, P.R. China