1. Center for Health and the Environment, University of California, Davis, CA, USA
2. Department of Gastroenterology, The First Affiliated Hospital of Shandong First Medical University, Shandong Provincial Qianfoshan Hospital, Jinan, China
3. Western China School of Public Health Department of Occupational and Environmental Health Sichuan University, Chengdu, China
4. School of Control Science and Engineering, Shandong University, Jinan, China
5. Department of Pediatrics, University of California, Davis, CA, USA