title: In reply.
authors.affiliation: Department of Internal Medicine, Seoul Medical Center, Seoul, Korea.
authors.forename: Suhyun
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon, Korea. ssunimd@kangwon.ac.kr.
authors.forename: Seon-Sook
authors.initials: SS
authors.lastname: Han