%0 Journal Article %A Miriam J. Johnson %A Magnus Ekström %A David C. Currow %T Observational studies and “the eye of the beholder” %D 2020 %R 10.1183/13993003.01637-2020 %J European Respiratory Journal %P 2001637 %V 56 %N 1 %U https://erj.ersjournals.com/content/erj/56/1/2001637.full.pdf