1. Department of Environmental Health and Occupational Medicine, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, China
2. BGI Genomics, BGI-Shenzhen, Shenzhen, China
3. Department of Periodical Press, West China Hospital, Sichuan University, Chengdu, China
4. Sichuan International Travel Health Care Center (Chengdu Customs Port Outpatient Department), Chengdu, China