Mina Takata1, Tatsuya Fujikawa2, Rieko Goto3. 1. The Post-graduate Education Center, Mitoyo General Hospital, Kannonji, Kagawa, Japan. 2. Department of Internal Medicine, Mitoyo General Hospital, Kannonji, Kagawa, Japan. 3. Department of Otorhinolaryngology, Head and Neck Surgery, Mitoyo General Hospital, Kannonji, Kagawa, Japan.