title: Answer to the letter of Caudri, van der Valk, de Jongste and Smit.
authors.affiliation: Department of Pediatrics, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul.
authors.forename: Jung Yeon
authors.initials: JY
authors.lastname: Shim
authors.forename: Soo-Jong
authors.initials: SJ
authors.lastname: Hong
authors.forename: Mi-Ae
authors.initials: MA
authors.lastname: Oh
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D009569:Nitric Oxide / Q000378:metabolism*; D010641:Phenotype; D012135:Respiratory Sounds / Q000502:physiology*
chemical_list: D009569:Nitric Oxide