○Jae-Ho Lee1, Nak-Jin Sung2, Yong-Jun Choi3
(1.Department of Family Medicine, College of Medicine, the Catholic University of Korea, Seoul, Korea, 2.Department of Family Medicine, Dongguk University Ilsan Hospital, Goyang, Korea, 3.Department of Social and Preventive Medicine and Health Services Research Center, College of Medicine, Hallym University, Chuncheon, Korea)
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