Correction

Abstract

Figure 2 Outline of sequence of exposure and sampling. All subjects received DE and FA, separated by washout; subjects were randomised to received either DE or FA first. Subjects were also randomized to receive allergen or saline first in the lingula (figure shows one of two possibilities therein). BAL, bronchoalveolar lavage; BW, bronchial wash; DE, diesel exhaust; FA, filtered air.Liu X, et al. Thorax 2016;71:383-385.