1. Department of Epidemiology, School of Public Health, Harbin Medical University, 157 Baojian Road, Nangang District, Harbin 150028, China
2. National Key Disciplines of Nutrition and Food Hygiene, Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, 157 Baojian Rd., Nangang District, Harbin 150028, China
3. NHC Key Laboratory of Etiology and Epidemiology, Harbin 150028, China