Schofield, J. 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 (Mar. 2021). DOI:https://doi.org/10.12890/2021_002378.