Safety and efficacy of a CXCR2 antagonist in patients with severe asthma and sputum neutrophils: a randomized, placebo-controlled clinical trial - Nair, P; Gaga, M; Zervas, E; Alagha, K; Hargreave, F E; O’Byrne, P M; Stryszak, P; Gann, L; Sadeh, J; Chanez, P (Clin Exp Allergy, 2012)