1. MOST-USDA Joint Research Center for Food Safety, School of Agriculture and Biology and State Key Laboratory of Microbial Metabolism; Shanghai Jiao Tong University; Shanghai 200240 P. R. China
2. Shanghai Institute for Food and Drug Control; Shanghai 201203 P. R. China
3. The Affiliated Hospital of Qingdao University; Qingdao 266003 P. R. China