1 Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
2 Department of Pediatrics, Kyoto University, Kyoto, Japan.
3 Department of Gastroenterology and Hepatology, Kyoto University Graduate School of Medicine, Kyoto, Japan. Electronic address: machan@kuhp.kyoto-u.ac.jp.
4 Department of Pediatrics, Kyoto University, Kyoto, Japan. Electronic address: kizawa@kuhp.kyoto-u.ac.jp.
5 Department of Pediatrics, Kyoto University, Kyoto, Japan. Electronic address: hietaro@kuhp.kyoto-u.ac.jp.