[1] Western Norway Univ Appl Sci, Dept Hlth & Caring Sci, Bergen, Norway
[2] Univ Bergen, Dept Global Publ Hlth & Primary Care, Bergen, Norway
[3] Univ Oslo, Inst Clin Med, Oslo, Norway
[4] Oslo Univ Hosp, Dept Transplantat Med, Oslo, Norway
[5] Duke Univ, Dept Family Med & Community Hlth, Durham, NC USA
[6] Loyola Univ Maryland, Dept Sociol, Baltimore, MD USA