RT Journal Article SR Electronic T1 How should one investigate a chronic cough? JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 84 OP 89 DO 10.3949/ccjm.77a.10033 VO 78 IS 2 A1 Tofts, Ryu P.H. A1 Ferrer, Gustavo A1 Oliveira, Eduardo YR 2011 UL http://www.ccjm.org/content/78/2/84.abstract AB