Impact of comorbidities on physical activity in COPD.
Sievi NA, Senn O, Brack T, Brutsche MH, Frey M, Irani S, Leuppi JD, Thurnheer R, Franzen D, Kohler M, Clarenbach CF.
Sievi NA, et al. Among authors: frey m.
Respirology. 2015 Apr;20(3):413-8. doi: 10.1111/resp.12456. Epub 2015 Jan 6.
Respirology. 2015.
PMID: 25565363
Clinical Trial.