title: PREFACE.
authors.forename: Yun Sil
authors.initials: YS
authors.lastname: Chang
mesh_terms: D006801:Humans; D000068104:Infant Health; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D056910:Republic of Korea; D012955:Societies, Medical / Q000458:organization & administration*