1. Gastroenterology Division; National Hospital Organization Yokohama Medical Center; Yokohama Japan
2. Diabetes and Endocrinology Division; Saiseikai Yokohama-shi Nanbu Hospital; Yokohama Japan
3. Endocrinology and Diabetes Division; Yokosuka Kyosai Hospital; Yokosuka Japan
4. Endocrinology and Metabolism Division; Yokohama Sakae Kyosai Hospital; Yokohama Japan
5. Diabetes and Endocrinology Division; Machida Municipal Hospital; Machida Japan
6. Iwasaki Naika Clinic; Yokohama Japan
7. Bayside Clinic; Yokohama Japan
8. Department of Endocrinology and Metabolism; Yokohama City University Graduate School of Medicine; Yokohama Japan
9. Department of Gastroenterology and Hepatology; Yokohama City University School of Medicine; Yokohama Japan