1. Department of Operative Dentistry and Cariology, Faculty of Odontology; University of Iceland, Vatnsmyrarvegur 16, 101; Reykjavik Iceland
2. Department of Operative Dentistry, School of Dentistry; University of North Carolina at Chapel Hill; Chapel Hill North Carolina 27599-7450
3. Department of Operative Dentistry, School of Dentistry; University of North Carolina at Chapel Hill, 440 Brauer Hall, CB #7450; Chapel Hill North Carolina 27599-7450
4. School of Dentistry; University of North Carolina at Chapel Hill, 1611 Koury Oral Health Sciences Building, CB #7450; Chapel Hill North Carolina 27599-7450
5. Department of Operative Dentistry, School of Dentistry; University of North Carolina at Chapel Hill, 448 Brauer Hall, CB #7450; Chapel Hill North Carolina 27599-7450
6. Department of Orthodontics, School of Dentistry; University of North Carolina at Chapel Hill, 275 Brauer Hall, CB #7454; Chapel Hill North Carolina 27599-7454
7. Department of Prosthodontics; School of Dentistry, University of North Carolina at Chapel Hill; 330 Brauer Hall, CB #7450 Chapel Hill North Carolina 27599-7450
8. Department of Operative Dentistry, School of Dentistry; University of North Carolina at Chapel Hill, 441 Brauer Hall, CB #7450; Chapel Hill North Carolina 27599-7450
9. Department of Operative Dentistry, School of Dentistry; University of North Carolina at Chapel Hill, 437 Brauer Hall, CB #7450; Chapel Hill North Carolina 27599-7450