The burden of long COVID: a multinational cohort analysis of Spanish and UK data including SARS-CoV-2 infections, reinfections, and matched contemporaneous test negative controls
Prieto Alhambra D., Kostka K., Roel E., Trinh N., Delmestri A., Mateu L., Paredes R., Duarte Salles T., Catala Sabate M., Jodicke A.