1. Department of Endocrinology, First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, China;
2. Department of Orthopaedics, Affiliated Zhongshan Hospital of Dalian University, Dalian, China;
3. Center for Health and the Environment, University of California, Davis CA, USA;
4. Center for Clinical Sciences Research, Stanford University School of Medicine, Stanford, CA, USA