https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0601-0
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0594-8
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0597-5
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0584-x
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0595-7
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0602-z
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0598-4
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0600-1
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0599-3
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0582-z
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0593-9
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-017-0554-8
https://bmcpulmmed.biomedcentral.com/articles/10.1186/s12890-018-0596-6