Early Cerebral Hypoperfusion in Patients with Orthostatic Intolerance Without Tachycardia During Head-Up Tilt Test is Independent of Vasovagal Response.By Antonio González-Hermosillo, Alan Rubio-Vega, Karla A. F. González-Olvera, Manuel Sierra-Beltrán, Andrei Kostin and Claudia Lerma
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