Comparison of observational methods to identify and characterize post-COVID syndrome in the Netherlands using electronic health records and questionnaires - Isabelle Bos; Lisa Bosman; Rinske van den Hoek; Willemijn van Waarden; Matthijs S. Berends; Maarten S. Homburg; Tim Olde Hartman; Jean Muris; Lilian S. Peters; Bart Knottnerus; Karin S. Hek; Robert A. Verheij (PLoS ONE, 2025)