CF Tummy Tracker: A Cystic Fibrosis–Specific Patient-Reported Outcome Measure for Daily Gastrointestinal Symptom Burden by Rebecca J. Calthorpe, BMBS, Hisham A. Saumtally, MBChB, Laura M. Howells, PhD, Natalie J. Goodchild, BA (Hons), Bethinn C. Evans, MSc, Zoe Elliott, Bu’Hussain Hayee, PhD, Siobhán B. Carr, MBBS, Caroline M. Elston, MBBS, Alexander A.R. Horsley, PhD, Daniel G. Peckham, DM, Helen L. Barr, PhD, Giles A.D. Major, PhD, Iain D. Stewart, PhD, Kim S. Thomas, Alan R. Smyth, MD

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