1. Central Military Hospital, University Hospital , Lundlaan 1, 3584 EZ Utrecht , The Netherlands
2. Defence COVID-19 Recovery Service, Defence Medical Rehabilitation Centre , Stanford Hall, Stanford Hall Estate, Stanford On Soar, Loughborough, Leicestershire, LE12 5QW , UK
3. Oxford University Hospitals NHS Foundation Trust , Headley Way, Oxford OX3 9DU , UK
4. Biomedical Research Foundation, Academy of Athens , 4 Soranou Ephessiou St., 115 27 Athens , Greece
5. Department of Prevention, Rehabilitation and Sports Medicine, Medical Faculty, University Hospital, Technical University Munich, Georg-Brauchle-Ring 56, Munchen , Germany
6. Academic Department of Military Rehabilitation, Defence Medical Rehabilitation Centre , Stanford Hall, Stanford on Soar, Loughborough LE12 5QN , UK
7. Department of Medicine and Surgery, University of Milano-Bicocca , Piazza dell'Ateneo Nuovo, 1, Milan, Province of Milan 20126 , Italy
8. Department of Cardiology, Istituto Auxologico Italiano, IRCCS, San Luca Hospital , Mosè Bianchi Street, 90 - 20149 Milan , Italy
9. Air Force Centre of Aerospace Medicine , Fuerstenfeldbruck , Germany
10. Department of Cardiology, Royal Brompton Hospital , Sydney Street, London, SW3 6NP , UK
11. School of Biomedical Engineering and Imaging Sciences, Kings College , London, Strand London, WC2R 2LS , UK