Cross-cultural adaptation and validation of the CFAbd-Score for gastrointestinal symptoms in patients with cystic fibrosis Flávia N.S. Infantes; Elizete A. Lomazi; Carlos Zagoya; Franziska Duckstein; Daniela O. Magro; Fernando Pessotto; Antônio F. Ribeiro; José D. Ribeiro; Jochen G. Mainz;