Protocol for establishing a core outcome set for evaluation in studies of pulmonary exacerbations in people with cystic fibrosis oleh Allison Tong, Alan Robert Smyth, Christopher C Blyth, Thomas L Snelling, Charlie McLeod, Richard Norman, Andre Schultz, Steve Webb, Zoe Elliott, Anne L Stephenson, Jamie Wood, Mitch Messer, Donald Van Devanter