1. Department of Diabetes, Endocrinology and Nutrition, Graduate School of Medicine, Kyoto University , Kyoto 606-8507 , Japan
2. Center for iPS Cell Research and Application, Kyoto University , Kyoto 606-8507 , Japan
3. Medical Research Institute, Kitano Hospital, PIIF Tazuke-kofukai , Osaka 530-8480 , Japan