1. Department of Periodontics; University of Texas Health Science Center at San Antonio; San Antonio TX USA
2. Department of Oral Surgery and Stomatology; School of Dental Medicine; University of Bern; Bern Switzerland
3. Clinic for Oral and Cranio-Maxillofacial Surgery; Hightech Research Center; University Hospital Basel; University of Basel; Basel Switzerland
4. Private Practice; Munich Germany
5. Robert K. Schenk Laboratory of Oral Histology; School of Dental Medicine; University of Bern; Bern Switzerland
6. Anatomische Anstalt; Ludwig-Maximilians University; Munich Germany
7. Private Practice; Dallas TX USA