1. Department of Rehabilitation Medicine, Hanyang University College of Medicine, Seoul, Korea.
2. Biostatistical Consulting and Research Lab, Medical Research Coordinating Center, Hanyang University, Seoul, Korea.
3. Department of Epidemiology, Graduate School of Public Health, Seoul National University, Seoul, Korea.
4. Daegu-Gyeongbuk Regional Cancer Center, Kyungpook National University Medical Center, Daegu, Korea.
5. Department of Preventive Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
6. Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea.