Abstract
Department of Family Medicine, The Catholic University of Korea School of Medicine, Seoul, Department of Family Medicine, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Department of Social and Preventive Medicine, Hallym University College of Medicine & Health Services Research Center, Chuncheon, Department of Family Medicine, Ilsan Hospital, Dongguk University College of Medicine, Goyang, Department of Family Medicine, Incheon St. Mary's Hospital, The Catholic University of Korea School of Medicine, Incheon, Korean Primary Care Research Group, Seoul, Korea
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