title: Letter by Ainslie et al regarding article, "Endogenous circadian rhythm in vasovagal response to head-up tilt".
authors.forename: Philip N
authors.initials: PN
authors.lastname: Ainslie
authors.forename: Nia C S
authors.initials: NC
authors.lastname: Lewis
authors.forename: Neil D
authors.initials: ND
authors.lastname: Eves
mesh_terms: D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D019462:Syncope, Vasovagal / Q000503:physiopathology*; D018667:Tilt-Table Test / Q000379:methods*