RT Journal Article SR Electronic T1 Third time’s the charm JF Breathe JO Breathe FD European Respiratory Society SP e72 OP e78 DO 10.1183/20734735.008217 VO 13 IS 3 A1 Maria Alvarenga A1 Susana Clemente A1 Paulo Calvinho A1 José Reis A1 Maria Helena Oliveira A1 Sofia Furtado YR 2017 UL http://breathe.ersjournals.com/content/13/3/e72.abstract AB