1. Department of Oral Cell Biology Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam The Netherlands
2. School/Hospital of Stomatology Zhejiang Chinese Medical University Hangzhou Zhejiang China
3. Department of Oral Implantology, the Affiliated Hospital of Stomatology, School of Stomatology Zhejiang University School of Medicine Hangzhou Zhejiang China
4. Private Practice prof. dr. D. Wismeijer Ellecom The Netherlands