1. School of Biology and Food Technology, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam
2. Faculty of Agriculture, Kochi University, Monobe B-200, Nankoku 783-8502, Japan
3. Department of Clinical Laboratory Medicine, Kochi University School of Medicine, Nankoku, Kochi 783-8505, Japan
4. Megmilk Snow Brand Co., Ltd., 1-1-2, Minamidai Kawagoe, Saitama, 350-1165, Japan