1. Department of Endocrinology and Metabolism, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Hirokoji, Kawaramachi dori, Kamikyo-ku, Kyoto, Japan.
2. Louis Pasteur Center for Medical Research, Sakyo-ku, Kyoto, Japan.
3. Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Hirokoji, Kawaramachi dori, Kamikyo-ku, Kyoto, Japan.