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Schofield, Jill R (2021) Persistent Antiphospholipid Antibodies, Mast Cell Activation Syndrome, Postural Orthostatic Tachycardia Syndrome and Post-COVID Syndrome: 1 Year On. European Journal of Case Reports in Internal Medicine, 8 (3). pp. 1-3. ISSN ISSN: 2284-2594