1. Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Korea.
2. Research Institute of Healthcare Bigdata, College of Medicine, Dankook University, Cheonan, Korea.
3. Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, Korea.
4. Department of Preventive Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.