title: The author replies:.
authors.forename: Hyuk J
authors.initials: HJ
authors.lastname: Choi
mesh_terms: D005260:Female; D006336:Heart Massage / Q000592:standards*; D006801:Humans; D008297:Male; D017410:Practice Guidelines as Topic / Q000592:standards*; D013909:Thorax / Q000033:anatomy & histology*