1. Department of Nutrition and Food Hygiene, West China School of Public Health and West China Fourth Hospital, Sichuan University, No. 16, 3rd section, South Renmin Road, 610041 Chengdu, Sichuan, China P.R.
2. College of Food and Biology Hebei University of Science and Technology, 36th Shitong Road, 050221 Shijiazhuang, Hebei, China P.R.
3. Basic Research and Development Center, Hebei Inatrual Bio-tech Co. Ltd., Shijiazhuang, Hebei, China P.R.