aAdelante Center of Expertise in Rehabilitation and Audiology, Hoensbroek, The Netherlands
bDepartment of Rehabilitation Medicine, School for Public Health and Primary Care (CAPHRI), Maastricht University, The Netherlands
cResearch group Lifestyle and Health, Faculty of Health Care, Utrecht University of Applied Sciences, The Netherlands
*Corresponding author. Address: Adelante Center of Expertise in Rehabilitation and Audiology, P.O. Box 88, 6430 AB Hoensbroek, The Netherlands. Tel.: +31 455282226; fax: +31 455282000.
E-mail addresses:email@example.com, j.verbunt@MUMC.nl
Submitted November 24, 2009; revised January 24, 2010; accepted January 26, 2010.