1. Korea Centers for Disease Control and Prevention, Cheongju, Korea.
2. Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea.
3. Department of Business Statistics, Hannam University, Daejeon, Korea.
4. Graduate School of Public Health, Seoul National University, Seoul, Korea.
5. Department of Preventive Medicine, Inje University College of Medicine, Busan, Korea.
6. Department of Preventive Medicine, Jeju National University College of Medicine, Jeju, Korea.
7. Graduate School of Public Health, Inje University, Busan, Korea.
8. Seoul National University College of Medicine, Seoul, Korea.