Variability in Long COVID Definitions and Validation of Published Prevalence Rates. - Wisk LE; L'Hommedieu M; Diaz Roldan K; Ebna Mannan I; Spatz ES; Weinstein RA; Venkatesh AK; Gottlieb M; Huebinger R; Rising KL; Montoy JCC; Stephens KA; et al. (JAMA network open, 2025)