[1] Univ Oslo, Inst Hlth & Soc, Ctr Med Ethics, Oslo, Norway
[2] Univ Oslo, Inst Hlth & Soc, Dept Gen Practice, Oslo, Norway
[3] Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Hlth Sci Aalesund, Alesund, Norway
[4] Univ Oslo, Inst Hlth & Soc, Dept Interdisciplinary Hlth Sci, Oslo, Norway
[5] Oslo Univ Hosp, Dept Geriatr Med, Oslo, Norway
[6] Univ Oslo, Inst Clin Med, Oslo, Norway
[7] Univ Oslo, Inst Hlth & Soc, Dept Hlth Management & Hlth Econ, Oslo, Norway
[8] Norwegian Inst Publ Hlth, Div Hlth Sci, Oslo, Norway