[1] Univ Gavle, Fac Engn & Sustainable Dev, Kungsbacksvagen 47, S-80176 Gavle, Sweden
[2] Uppsala Univ, Dept Publ Hlth & Caring Sci, Box 564, S-75122 Uppsala, Sweden
[3] Umea Univ, Dept Nursing, Umea, Sweden
[4] Univ Gavle, Fac Hlth & Occupat Studies, Kungsbacksvagen 47, S-80176 Gavle, Sweden