{{Cite journal| doi = 10.1371/journal.pone.0204701| issn = 1932-6203 (Electronic) 1932-6203 (Linking)| volume = 13| issue = 9| pages = –0204701| last1 = Veron| first1 = C.| last2 = Pautex| first2 = S.| last3 = Weber| first3 = C.| last4 = Janssens| first4 = J. P.| last5 = Cedraschi| first5 = C.| title = Recollection of participating in a trial: A qualitative study of patients with severe and very severe chronic obstructive pulmonary disease| journal = PLoS One| date = 2018-09-28| pmid = 30261031}}