R Negayama1, T Fujikawa2. 1. The Post-graduate Education Center, Mitoyo General Hospital, 708 Himehama Toyohama, Kanonji, Kagawa, 769-1695, Japan. 2. Department of General Internal Medicine, Mitoyo General Hospital, 708 Himehama Toyohama, Kanonji, Kagawa, 769-1695, Japan.