title: Reply to Hejjel.
authors.affiliation: Department of Anesthesiology, National Taiwan University Hospital, Taipei, Taiwan;
authors.forename: Yong-Ping
authors.initials: YP
authors.lastname: Wang
authors.forename: Terry B J
authors.initials: TB
authors.lastname: Kuo
authors.forename: Cheryl C H
authors.initials: CC
authors.lastname: Yang
mesh_terms: D017704:Baroreflex / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D015656:Respiratory Mechanics / Q000502:physiology*; D056152:Respiratory Rate / Q000502:physiology*