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Study participant recruitment flowchart. Participants with Long COVID with self‐reported exercise intolerance and fatigue were identified from the post COVID‐19 clinic at University College London Hospital (UCLH). The study research team at Bloomsbury Centre for Clinical Phenotyping (BCCP) invited eligible individuals to attend a research visit. Healthy Control participants sex and age (5‐year banding) were recruited from the staff and student population at UCL.
