[1] Univ Dundee, Sch Nursing & Midwifery, Res & Postgraduate Studies, Dundee DD1 4HJ, Scotland
[2] Lund Univ, Fac Med, Dept Hlth Sci, S-22100 Lund, Sweden
[3] Trinity Coll Dublin, Sch Nursing & Midwifery, Dublin, Ireland
[4] Univ Turku, Dept Nursing Sci, SF-20500 Turku, Finland