1 Department of Internal Medicine, Tokyo Bay Urayasu Ichikawa Medical Center, Chiba, Japan; Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan. Electronic address: yoheimasuda@s.okayama-u.ac.jp.
2 Department of Internal Medicine, Tokyo Bay Urayasu Ichikawa Medical Center, Chiba, Japan.