[1] Aarhus Univ, Horsens Hosp Res Unit, DK-8700 Horsens, Denmark
[2] Aarhus Univ, Dept Publ Hlth, DK-8700 Horsens, Denmark
[3] Univ Turku, Finnish Postgrad Sch Nursing Sci, Turku, Finland
[4] Univ Turku, Dept Nursing Sci, Turku, Finland
[5] Univ Lisbon, P-1699 Lisbon, Portugal
[6] Univ Manchester, Sch Nursing Midwifery & Social Work, Manchester, Lancs, England