[1] Seoul Natl Univ Hosp, Dept Family Med, Seoul 110744, South Korea
[2] Inha Univ Hosp, Dept Social & Prevent Med, Inchon, South Korea
[3] Seoul Natl Univ, Inst Hlth Policy & Management, Dept Hlth Policy Management, Seoul, South Korea
[4] Harvard Univ, Sch Publ Hlth, Dept Soc Human Dev & Hlth, Boston, MA 02115 USA
[5] Hlth Insurance Review & Assessment Serv, Seoul, South Korea
[6] Natl Canc Control Inst, Dept Hlth Policy & Management, Goyang, South Korea
[7] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Canc Educ Ctr, Suwon, South Korea
[8] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol Hlth Behav & Soc, Baltimore, MD USA
[9] Kyung Hee Univ, Dept Hlth Serv Management, Seoul, South Korea
[10] Univ Penn, Leonard Davis Inst Hlth Econ, Philadelphia, PA 19104 USA