[1] Univ Bergen, Ctr Elderly & Nursing Home Med, Dept Publ Hlth & Primary Care, POB 7800, NO-5020 Bergen, Norway
[2] VID Specialized Univ, Fac Hlth Studies, Bergen, Norway
[3] Western Norway Univ Appl Sci, Fac Hlth & Social Sci, Dept Hlth & Caring Sci, Bergen, Norway
[4] Oslo Univ Hosp, Rikshosp, Norwegian Natl Advisory Unit Womens Hlth, Oslo, Norway
[5] Municipal Bergen, Bergen, Norway
[6] Univ Bergen, Dept Publ Hlth & Primary Care, Bergen, Norway