1. Department of Endocrinology and Gansu Provincial Hospital, Lanzhou, China.
2. Gansu Clinical Research Center for Metabolic Diseases, Lanzhou, China.
3. School of Clinical Medicine, Ningxia Medical University, Yinchuan, China.
4. Department of Radiology, Gansu Provincial Hospital, Lanzhou, China.
5. School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia.