1. Office of Drug Safety Information II, Korea Institute of Drug Safety & Risk Management, Seoul, Korea.
2. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.
3. Medical Research Collaborating Center, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea.
4. Medical Research Center, Seoul National University, Seoul, Korea.
5. Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University, School of Medicine, Seoul, Korea.
6. Department of Family Medicine, Seoul National University Bundang Hospital, Seoul, Korea.