1. Christchurch Regenerative Medicine and Tissue Engineering (CReaTE) Group, Department of Orthopaedic Surgery, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
2. Medical Technologies Centre of Research Excellence (MedTech CoRE), Auckland 1010, New Zealand
3. Department of Material Science and Engineering, North Carolina State University, 911 Partners Way, Raleigh, North Carolina 27606, USA