UK cf gene therapy consortium tracking study: Change in sputum properties in response to IV antibiotics - Griesenbach, U; Jeswiet, SB; Larsen, MDB; Bakar, Y; Voase, NWG; Gammie, FM; Mullard, KE; Geddes, DM; Davies, JC; Alton, EWFW; Marriott, C; Gray, R; et al. (B M J PUBLISHING GROUP, 2007)