1. Department of Restorative Dentistry, Periodontic Unit, National Dental Centre Singapore, Singapore, Singapore
2. Oral Health ACP, Duke NUS Medical School, Singapore, Singapore
3. Singapore Oral Microbiomics Initiative (SOMI), National Dental Research Institute Singapore (NDRIS), National Dental Centre Singapore, Singapore, Singapore
4. Department of Periodontology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University, Amsterdam, The Netherlands