WS21.4 The role of gastrointestinal endoscopic workup in double lung transplanted cystic fibrosis patients – a prospective study involving 25 consecutive patients. - Dolak, W.; Halilbasic, E.; Schmidt, D.; Staufer, K.; Tribl, B.; Trauner, M.; Kazemi-Shirazi, L. (Journal of Cystic Fibrosis, 2017)