CF: cystic fibrosis; M: male; F: female; FEV1: forced expiratory volume in one second; FVC: forced vital capacity; NE: neutrophil elastase; CFTR: cystic fibrosis transmembrane conductance regulator; MRSA: methicillin-resistant staphylococcus aureus. This evidence concerns the gene CFTR and cystic fibrosis.