1. Department of Epidemiology, School of Public Health, Air Force Medical University, Xi’an, Shaanxi province, China
2. Department of chronic disease control, Gansu Provincial Centre for Disease Control and Prevention, Lanzhou, Gansu province, China
3. School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou, Gansu province, China
4. Laboratory for Lipid Medicine and Technology, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
5. Department of chronic disease control, Center of disease control of Wuwei, Wuwei, Gansu province, China
6. Institute of Endemic Diseases, Environment and Diseases-related Gene of Key Laboratory of Education Ministry, Medical School of Xi’an Jiaotong University, Xi’an, Shaanxi province, China