title: Comment on "Transcranial Doppler ultrasonographic evaluation of cerebral circulation during passive tilting in patients with Parkinson's disease".
authors.forename: Vijay K
authors.initials: VK
authors.lastname: Sharma
authors.forename: Bernard P L
authors.initials: BP
authors.lastname: Chan
mesh_terms: D001783:Blood Flow Velocity / Q000502:physiology*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D006801:Humans; D010300:Parkinson Disease / Q000000981:diagnostic imaging* / Q000503:physiopathology; D018667:Tilt-Table Test; D017585:Ultrasonography, Doppler, Transcranial / Q000379:methods*