Affiliation: | (1) Department of Rehabilitation Medicine, Center for Rehabilitation, University Medical Center Groningen, University of Groningen, PO Box 30002, 9750 RA Haren, The Netherlands;(2) Department of Pulmonary Diseases, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;(3) Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands |