Translation of in vitro findings to patients with asthma: a timely and compelling challenge.

Competing Interests: Conflict of interest: P.S. Hiemstra reports grants from Boehringer Ingelheim and Galapagos, outside the submitted work. Conflict of interest: P.J. Sterk reports being Scientific Advisor and having a formally inconsiderable interest in the start-up company Breathomix, a start-up producing eNoses and licensing a cloud application for data analysis, during the conduct of the study.