RT Journal Article SR Electronic T1 What is the role of roflumilast in chronic obstructive pulmonary disease? JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 13 OP 15 DO 10.3949/ccjm.84a.15150 VO 84 IS 1 A1 Chris Lau A1 Atul C. Mehta A1 Umur Hatipoglu YR 2017 UL http://www.ccjm.org/content/84/1/13.abstract AB