1. Sumitomo Hospital; Department of Nephrology; Kitaku nakanoshima 5-3-20 Osaka-shi Osaka Japan
2. 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
3. Hyogo Prefectural Amagasaki General Medical Center; Department of Nephrology; Higashi-Naniwa-Cho 2-17-7 Amagasaki Hyogo Japan 660-8550
4. Hyogo Prefectural Amagasaki General Medical Center; Hospital Care Research Unit; Higashi-Naniwa-Cho 2-17-77 Amagasaki Hyogo Hyogo Japan 606-8550
5. Kameda Medical Center; Department of Intensive Care Medicine; Kamogawa-shi Chiba Japan
6. Hyogo Prefectural Amagasaki General Medical Center; Department of Respiratory Medicine; 2-17-77, Higashi-Naniwa-Cho Amagasaki Hyogo Japan 660-8550
7. Monash University; Australian and New Zealand Intensive Care Research Centre, Department of Epidemiology and Preventive Medicine; Melbourne VIC Australia