1. Department of Restorative Dentistry, National Dental Centre Singapore, Singapore
2. Discipline of Periodontics, National University of Singapore, Singapore
3. Department of Periodontology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
4. School of Dentistry, The University of Queensland, Brisbane, Australia
5. School of Dentistry, Center for Oral-facial Regeneration, Rehabilitation and Reconstruction (COR3), The University of Queensland, Brisbane, Australia
6. National Dental Research Institute Singapore, National Dental Centre Singapore, Singapore