1. Department of Nutrition and Food Hygiene, Harbin Medical University, Harbin 150081, China
2. Department of Biomedical Sciences, Faculty of Sciences, University of Ngaoundere, Ngaoundere, Cameroon
3. Department of Epidemiology, Public Health College, Harbin Medical University, Harbin 150081, China
4. Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China