[1] Univ Hull, Hull York Med Sch, Wolfson Palliat Care Res Ctr, Kingston Upon Hull, N Humberside, England
[2] Univ Technol Sydney, Fac Hlth, IMPACCT, Ultimo, NSW 2007, Australia
[3] Univ Dublin, Trinity Coll Dublin, Dublin D02 PN40, Ireland
[4] Flinders Univ S Australia, Coll Med & Publ Hlth, Adelaide, SA 5042, Australia
[5] Flinders Univ S Australia, Res Ctr Palliat Care Death & Dying RePaDD, Adelaide, SA 5042, Australia
[6] Univ Sydney, Woolcock Inst Med Res, Australian Ctr Airways Dis Monitoring ACAM, Sydney, NSW, Australia
[7] Lund Univ, Dept Clin Sci, Div Resp Med & Allergol, S-22100 Lund, Sweden