title: Are small observational studies sufficient evidence for a recommendation of head-up sleeping in all patients with debilitating orthostatic hypotension? MacLean and Allen revisited after 70 years.
authors.forename: Wouter
authors.initials: W
authors.lastname: Wieling
authors.forename: S R
authors.initials: SR
authors.lastname: Raj
authors.forename: R D
authors.initials: RD
authors.lastname: Thijs
mesh_terms: D006801:Humans; D007024:Hypotension, Orthostatic / Q000628:therapy*; D011187:Posture / Q000502:physiology*; D012890:Sleep