1. Rotterdam, Schÿf, and Maastricht, The Netherlands, Houston, Texas, and Orono, Maine
2. Department of Otolaryngology-Head and Neck Surgery, University Hospital Daniel den Hoed
3. School of Public Health, University of Texas-Houston Health Science Center; the
4. Institute for Health and Environmental Issues
5. Department of Psychology, University of Maine; and the
6. Department of Health Education, Maastricht University.