1. School of Health Sciences (Nursing Science), University of Tampere, FI-33014 Tampere, Finland
2. Hospital District of Helsinki and Uusimaa, Hyvinkää Hospital, Sairaalankatu 1, FI-05850 Hyvinkää, Finland
3. National Institute for Health and Welfare, P.O. Box 30, FI-00271 Helsinki, Finland
4. Science Center, Pirkanmaa Hospital District, School of Health Sciences, University of Tampere, FI-33014 Tampere, Finland
5. Pirkanmaa Hospital District, P.O. Box 2000, FI-33521 Tampere, Finland
6. Southern Ostrobothnia Hospital District, Huhtalantie 54, FI-60220 Seinäjoki, Finland