title: Inhaled anticholinergics for chronic obstructive pulmonary disease: comment on "Inhaled anticholinergic drug therapy and the risk of acute urinary retention in chronic obstructive pulmonary disease".
authors: Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA. ssingh31@jhu.edu
authors: Sonal
authors: S
authors: Singh
authors: Curt D
authors: CD
authors: Furberg