1. Department of Preventive Medicine, College of Medicine, Dong-A University, Busan, South Korea
2. Department of Internal Medicine, College of Medicine, Pusan National University, South Korea
3. Busan Center for Infectious Disease Control and Prevention, Pusan National University Hospital, Busan, South Korea
4. Korea Disease Control and Prevention Agency, Cheongju, South Korea
5. Department of Preventive Medicine/Institute of Community Health, College of Medicine, Hanyang University, Seoul, South Korea
6. Department of Preventive Medicine, College of Medicine, Pusan National University, Busan, South Korea