1. Biomaterials and Tissue Engineering Group, Department of Oral Biology, University of Leeds, St. James's University Hospital, Leeds, United Kingdom.
2. Biomineralisation Group, Department of Oral Biology, University of Leeds, St. James's University Hospital, Leeds, United Kingdom.
3. Department of Oral Pathology, Faculty of Dentistry, Suez Canal University, Ismailia, Egypt.
4. Department of Materials, Imperial College London, London, United Kingdom.
5. Institute of Biomaterials, University of Erlangen-Nuremberg, Erlangen, Germany.