[1] Liverpool Heart & Chest Hosp NHS Trust, Liverpool, Merseyside, England
[2] Royal Liverpool Univ Hosp, Liverpool, Merseyside, England
[3] Postgrad Program Resp Sci UFRGS, Porto Alegre, RS, Brazil
[4] UFRJ, Postgrad Program Radiol, Rio De Janeiro, Brazil
[5] Univ Fed Fluminense, Niteroi, RJ, Brazil
[6] Pennine Acute Hosp NHS Trust, Great Manchester, Brazil