1 Kyorin University School of Medicine, Department of Respiratory Medicine, 6-20-2 Shinkawa, Mitaka City, Tokyo 181-8611, Japan. Electronic address: sara@yd5.so-net.ne.jp.
2 Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Department of Clinical Laboratory, 6-20-2 Shinkawa, Mitaka City, Tokyo 181-8611, Japan.
3 Kyorin University School of Medicine, Department of Respiratory Medicine, 6-20-2 Shinkawa, Mitaka City, Tokyo 181-8611, Japan.