1. Department of Endocrinology, Beijing Friendship Hospital, Capital Medical University, Beijing, China.
2. Department of General Surgery & Obesity and Metabolic Disease Center, China–Japan Friendship Hospital, Beijing, China.
3. Department of Endocrinology, Beijing Daxing District People's Hospital, Beijing, China.
4. Department of Endocrinology, Traditional Chinese Medicine Hospital Affiliated to Xinjiang Medical University, Urumqi, China.