1. Department of Nursing Science, University of Eastern Finland, Kuopio Campus, P.O. Box 1627, Kuopio FI-70211, Finland
2. City of Helsinki Social Services, Health Care and Rescue Services Division, P.O. Box 6000, Helsinki FI-00099, Finland
3. Department of Nursing Science, University of Turku, Medisiina B, Turku FI-20014, Finland