1. Department of Environmental Health and Engineering, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland 21205, United States
2. Department of Biological Chemistry, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, United States
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21205, United States
4. Qidong Liver Cancer Institute, Qidong People’s Hospital, Affiliated Qidong Hospital of Nantong University, Qidong, Jiangsu 226200, P. R. China
5. Public Health Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, United States