Reduction in abdominal symptoms (CFAbd-Score), faecal M2-pyruvate-kinase and Calprotectin over one year of treatment with Elexacaftor-Tezacaftor-Ivacaftor in people with CF aged >=12 years - The RECOVER study https://www.medrxiv.org/content/10.1101/2023.07.10.23292435