1. Texas Tech University Health Sciences Center El PasoWoody L. Hunt School of Dental Medicine El Paso Texas USA
2. Specialty Program in Periodontics National University of Rosario School of Dentistry Rosario Argentina
3. Department of Restorative Dentistry Oregon Health and Sciences University School of Dentistry Portland Oregon USA
4. Private Practice San Felipe Mexico
5. Department of Operative Dentistry University of Iowa College of Dentistry Iowa City, Iowa USA