From the Department of Health Services Research, Institute of Public Health, University of Aarhus, Denmark.
Acknowledgment date: May 21, 2007; Revision date: July 1, 2007; Accepted date: July 18, 2007.
The manuscript submitted does not contain information about medical device(s)/drug(s).
Professional, organizational, and other funds were received in support of this work. No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.
Supported by Danish Physiotherapists' Research Foundation and the Health Council of the Municipality of Aarhus, Denmark.
Address correspondence and reprint requests to Birgit Skoffer, MPH, University of Aarhus, Building 264, Vennelyst Boulevard, DK-8000 Aarhus C, Denmark; E-mail: [email protected].