1. Centre for Bone Tissue Engineering, School of Chemical and Biomedical Engineering; Nanyang Technological University; Singapore 637459 Singapore
2. Academic Clinical Program (Research), National Dental Centre of Singapore, Singapore 168938; Singapore
3. Department of Medicine and Medical Science, School of Medicine; University College Dublin, Dublin; Ireland
4. Department of Obstetrics and Gynaecology; Yong Loo Lin School of Medicine, National University of Singapore; Singapore 119077 Singapore
5. Department of Reproductive Medicine; KK Women's and Children's Hospital; Singapore 229899 Singapore
6. Cancer and Stem Cell Biology Program; Duke-NUS Graduate Medical School; Singapore 169857 Singapore