Takanobu Hirosawa1, Tetsu Sakamoto2, Taro Shimizu2. 1. Department of Diagnostic and Generalist Medicine, Dokkyo Medical University, Mibu-cho, Simotsuga-gun Tochigi, Japan. Electronic address: t.hirosawa1983@gmail.com. 2. Department of Diagnostic and Generalist Medicine, Dokkyo Medical University, Mibu-cho, Simotsuga-gun Tochigi, Japan.