1. Department of Laboratory Medicine, Inje University Ilsan Paik Hospital, Goyang
2. Department of Pulmonary and Critical Care Medicine, Inje University Ilsan Paik Hospital, Goyang
3. Department of Family Medicine, Catholic University of Korea, School of Medicine, Seoul
4. Department of Family Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul
5. Department of Family Medicine, Dongguk University Ilsan Hospital, Goyang, Republic of Korea