1. Department of Rehabilitation Kobe City Medical Center General Hospital Kobe Japan
2. Department of Public Health Kobe University Graduate School of Health Sciences Kobe Japan
3. Department of Respiratory Medicine Kobe City Medical Center General Hospital Kobe Japan
4. Department of Clinical Research Center Kobe City Medical Center General Hospital Kobe Japan
5. Department of Clinical Epidemiology Hyogo College of Medicine Nishinomiya Japan