1. Medical Research and Laboratory Diagnostic Center, Jinan Central Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250013
2. Department of Medical Education, Jinan Central Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250013, P.R. China
3. Department of Food Science and Nutrition, University of Jinan, Jinan, Shandong 250022, P.R. China