1. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.
2. National Cancer Control Institute, National Cancer Center, Goyang, Korea.
3. Division of VPD Control and NIP, Korea Centers for Disease Control & Prevention, Cheongwon, Korea.
4. Cancer Research Institute, Seoul National University, Seoul, Korea.
5. Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea.
6. Department of Preventive Medicine, College of Medicine, Konyang University, Daejeon, Korea.
7. Department of Health Policy and Management, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Pediatrics, Seoul National University College of Medicine, Seoul, Korea.
9. Department of Biomedical Science, Seoul National University Graduate School, Seoul, Korea.