1. Kameda Medical Center; Department of Intensive Care Medicine; Kamogawa-shi Chiba Japan
2. Chiba-Nishi General Hospital; Department of Cardiology; Matsudo-shi Chiba Japan
3. Keio University School of Medicine; Department of Preventive Medicine and Pubic Health; 35 Shinanomachi Shinjyuku-ku Tokyo Japan 160-8582
4. Hyogo Prefectural Amagasaki General Medical Center; Hospital Care Research Unit; Higashi-Naniwa-Cho 2-17-77 Amagasaki Hyogo Hyogo Japan 606-8550
5. School of Public Health in the Graduate School of Medicine, Kyoto University; Department of Healthcare Epidemiology; Yoshida Konoe-cho, Sakyo-ku Kyoto Japan 606-8501
6. Hyogo Prefectural Amagasaki General Medical Center; Department of Respiratory Medicine; 2-17-77, Higashi-Naniwa-Cho Amagasaki Hyogo Japan 660-8550