1. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117 576, Singapore.
2. College of Materials Science and Engineering, Hunan University, Changsha 410082, P.R. China.
3. Prestige BioResearch Pte Ltd, 15 Tech Park Crescent, Singapore 638117, Singapore.
4. College of Veterinary Medicine, Kyungpook National University, Daegu 41566, Republic of Korea.
5. Department of Orthopaedic Surgery, National University of Singapore, 5 Lower Kent Ridge Road, Singapore 119 074, Singapore.
6. Department of Electrical and Computer Engineering, National University of Singapore, 2 Engineering Drive 3, Singapore 117576, Singapore.