H Matsuura1,2, S Sugiyama2. 1. Department of General Internal Medicine, Kurashiki Central Hospital, 1-1-1, Miwa, Kurashiki-city, Okayama, Japan. 2. Department of General Internal Medicine, Mitoyo General Hospital, 708, Himehama, Toyohama-cho, Kanonji-city, Kagawa, Japan.