Affiliation: | 1. Department of Health Promotion, Vestfold University College, P.O. Box 2243, 3101, T?nsberg, Norway 2. Fafo Institute for Labor and Social Research, P.O. Box 2947, T?yen, 0608, Oslo, Norway 3. Department of Nursing Science, University of Oslo, 0316, Oslo, Norway 4. Telemark Research Institute, P.O. Box 4, 3833, B? i Telemark, Norway
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