Cuypers et al. BMC Public Health 2012, 12:820 http://www.biomedcentral.com/1471-2458/12/820 Acknowledgements The present study was supported by a grant of The Norwegian Research Council. The Nord-Trøndelag Health Study (HUNT) is cooperation between the HUNT Research Center, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), the Central Norway Health Authority, the Norwegian Institute for Public Health and the Nord-Trøndelag County Council. We wish to thank all participants of the HUNT Study; without their participation in subsequent surveys this study would not have been possible. Author details 1HUNT Research Center, Department of Public Health and General Practice, Faculty of Medicine, Norwegian, University of Science and Technology, Forskningsveien 2, 7600, Levanger, Norway. 2Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, NTNU, Trondheim 7491, Norway. 3Department of Physical Medicine and Rehabilitation, Levanger Hospital, Nord-Trøndelag Health Trust, Kirkegata 2, Levanger 7600, Norway. 4Department of Health Promotion, Nord-Trøndelag County Council, Seilmakersgata 2, Steinkjer 7735, Norway. 5Psychiatric Department, Levanger Hospital, Nord-Trøndelag Health Trust, Kirkegata 2, Levanger 7600, Norway. Received: 27 March 2012 Accepted: 10 September 2012 Published: 22 September 2012 References 1. 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