1. Division of Postgraduate Prosthodontics; Tufts University School of Dental Medicine; Boston Massachusetts
2. Department of Prosthodontics; University of Rochester Eastman Institute for Oral Health; Rochester New York
3. Division of Postgraduate Prosthodontics; Pontifical Catholic University of Rio Grande do Sul; Porto Alegre Brazil
4. Department of Public Health and Community Service; Tufts University School of Dental Medicine; Boston Massachusetts