1. Department of Metabolic Medicine, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8556, Japan
2. Ueki Hospital, Kumamoto 861-0136, Japan
3. Saiseikai Kumamoto Hospital, Kumamoto 861-4193, Japan
4. Kumamoto Social Insurance General Hospital, Yatsushiro 866-0856, Japan
5. Minamata City Hospital and Medical Center, Minamata 867-0041, Japan