1. Department of Dentistry—Biomaterials, Radboud University Medical Center, Nijmegen, The Netherlands.
2. School of Stomatology, Shandong University, Jinan, Shandong, China.
3. Laboratory of Functional and Molecular Imaging, NINDS, National Institutes of Health, Bethesda, Maryland.
4. National Dental Centre Singapore, Singapore, Singapore.
5. Duke-NUS Medical School, Singapore, Singapore.