1. Sichuan University; West China School of Public Health; South Renmin Road No. 16 Chengdu Sichuan Province China 610041
2. Fujian Medical University; School of Public Health; Fujian China
3. West China College of Stomatology, Sichuan University; Department of Orthodontics; No. 14, Section Three, Ren Min Nan Road Chengdu Sichuan China 610041
4. The General Hospital of the People's Liberation Army (PLAGH) (also Hospital 301); Department of Neurology; No. 28, Fuxing Road Beijing Beijing China 100853