1 Department of Family Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea. [email protected].
2 Department of Biostatistics, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.
3 Department of Family Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
4 Deparment of Family Medicine, Chamjoeun Hospital, Gwangju, Korea.
5 Department of Preventive Medicine, University of Ulsan College of Medicine, Seoul, Korea.