1. Department of Diabetes and Endocrinology, Saiseikai Yokohamashi Tobu Hospital, Yokohama 230-0012, Japan.
2. Diabetes, Metabolism and Endocrinology, Toho University, Tokyo 143-8541, Japan.
3. Nutrition Support Team, Saiseikai Yokohamashi Tobu Hospital, Yokohama 230-0012, Japan.
4. Department of Food Science, Faculty of Home Economics, Otsuma Women's University, Tokyo 102-8357, Japan.