1. Private Practice Ciudad de Guatemala Guatemala Guatemala
2. Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine University of Bern Bern Switzerland
3. Department of Prosthodontics, Faculty of Dentistry Istinye University İstanbul Turkey
4. Division of Restorative and Prosthetic Dentistry, College of Dentistry The Ohio State University Columbus Ohio USA
5. Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine University of Bern Bern Switzerland