Published on in Vol 16, No 12 (2014): December

1 Asan Medical Center, Department of Emergency Medicine, University of Ulsan, College of Medicine, Seoul, Korea, Republic of
2 Asan Medical Center, Department of Preventive Medicine, University of Ulsan, College of Medicine, Seoul, Korea, Republic of
3 Asan Medical Center, Department of Biomedical Informatics, Seoul, Korea, Republic of
4 Brigham and Women's Hospital, Division of General Medicine and Primary Care, Boston, MA, United States
5 Harvard Medical School, Boston, MA, United States
6 Daum Communications, Search Development Unit, Seoul, Korea, Republic of