[1] Univ Southern Denmark, Hosp Soenderjylland, Inst Reg Hlth Res, Odense, Denmark
[2] Univ Hosp Southern Jutland, Hosp Soenderjylland, Dept Internal Med, Med Res Unit, Aabenraa, Denmark
[3] Odense Univ Hosp, Ctr Innovat Med Technol, Odense, Denmark
[4] Univ Southern Denmark, Fac Hlth Sci, Family Focused Healthcare Res Ctr FaCe, Dept Clin Res, Odense, Denmark
[5] Univ Queensland, Fac Med, Ctr Online Hlth, Brisbane, Australia
[6] HELIOS Klinikum Schleswig, Dept Anesthesiol Intens Care Palliat Med & Pain Th, Schleswig, Germany
[7] Univ Cologne, Fac Med, Dept Palliat Med, Cologne, Germany
[8] Univ Cologne, Univ Hosp, Cologne, Germany
[9] Odense Univ Hosp, Dept Oncol, Odense, Denmark
[10] Univ Hosp Southern Jutland, Hosp Soenderjylland, Dept Internal Med, Med Res Unit, Kresten Philipsens Vej 15, DK-6200 Aabenraa, Denmark