Orthostatic Challenge Causes Distinctive Symptomatic, Hemodynamic and Cognitive Responses in Long COVID and Myalgic Encephalomyelitis/Chronic Fatigue Syndrome oleh Suzanne D. Vernon, Sherlyn Funk, Lucinda Bateman, Gregory J. Stoddard, Sarah Hammer, Karen Sullivan, Jennifer Bell, Saeed Abbaszadeh, W. Ian Lipkin, Anthony L. Komaroff