1. Department of Preventive Medicine, College of Medicine, Ewha Womans University, Seoul, Korea.
2. Graduate Program in System Health Science and Engineering, Department of Preventive Medicine, College of Medicine, Ewha Womans University, Seoul, Korea.
3. Clinical Trial Center, Ewha Womans University Mokdong Hospital, Seoul, Korea.
4. Department of Preventive Medicine, College of Medicine, Chung-Ang University, Seoul, Korea.
5. Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Korea.
6. Institute for Health Promotion, Department of Epidemiology and Health Promotion, Graduate School of Public Health, Yonsei University, Seoul, Korea.