1. Department of Endocrinology and Metabolic, The First Hospital of Lanzhou University, Lanzhou, Gansu, P.R.China
2. Department of General Family Medicine, The First Hospital of Lanzhou University, Lanzhou, Gansu, P.R.China
3. Lintao Country People’s Hospital, Lintao, Dingxi, Gansu, P.R.China
4. Department of Respiratory medicine, The First Hospital of Lanzhou University, Lanzhou, Gansu, P.R.China