Tsukasa Saito1, Naoyuki Hasebe2. 1. Department of Internal Medicine, Cardiovascular, Respiratory and Neurology Division, Asahikawa Medical University, Hokkaido, Japan. tsukasa@asahikawa-med.ac.jp. 2. Department of Internal Medicine, Cardiovascular, Respiratory and Neurology Division, Asahikawa Medical University, Hokkaido, Japan.