1. Department of Biologic and Materials Sciences & Prosthodontics University of Michigan School of Dentistry Ann Arbor Michigan USA
2. Clinic of Reconstructive Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
3. Department of Restorative Dentistry School of Dentistry, University of Washington Seattle Washington USA
4. Kois Center Seattle Washington USA
5. Graduate Prosthodontics, School of Dental Medicine Tufts University Boston Massachusetts USA
6. Department of Periodontics and Oral Medicine University of Michigan School of Dentistry Ann Arbor Michigan USA