Efficacy of aclidinium bromide 400 μg twice daily compared with placebo and tiotropium in patients with moderate to severe COPD. - Fuhr R; Magnussen H; Sarem K; Llovera AR; Kirsten AM; Falqués M; Caracta CF; Garcia Gil E; Fuhr, Rainard; Magnussen, Helgo; Sarem, Kristina; Llovera, Anna Ribera; et al. (CHEST, 2012)