Celletti, Claudia, Beatrice Borsellino, Marco Castori, Federica Censi, Giovanni Calcagnini, Filippo Camerota, and Stefano Strano. “A New Insight on Postural Tachycardia Syndrome in 102 Adults With Hypermobile Ehlers-Danlos Syndrome/Hypermobility Spectrum Disorder”. Monaldi Archives for Chest Disease 90, no. 2 (May 20, 2020). Accessed March 29, 2024. https://www.monaldi-archives.org/macd/article/view/1286.