title: The authors reply.
authors: Joo Myung
authors: JM
authors: Lee
authors: Young-Jae
authors: YJ
authors: Cho
mesh_terms: D006801:Humans; D056888:Patient Positioning; D016684:Prone Position / Q000502:physiology*; D012121:Respiration, Artificial; D012128:Respiratory Distress Syndrome / Q000628:therapy*