Corrigendum to "A multicenter, randomized, double-blind dose-ranging study of glycopyrrolate/formoterol fumarate fixed-dose combination metered dose inhaler compared to the monocomponents and open-label tiotropium dry powder inhaler in patients with moderate-to-severe COPD" [Respir. Med. 120 November 2016 16–24]. (August 2017) - Tashkin, Donald P.