1. Department of Materials, Engineering Building A, University of Manchester, Manchester M13 9PL, U.K.
2. Department of Engineering, Manchester Metropolitan University, Manchester M1 5GD, U.K.
3. Advanced Materials and Bioengineering Research Centre (AMBER), Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin D02 YN77, Ireland
4. Tissue Engineering Research Group, Department of Anatomy & Regenerative Medicine, Royal College of Surgeons in Ireland, Dublin D02 YN77, Ireland
5. Laboratory for Innovations in Microengineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
6. Terasaki Institute for Biomedical Innovations, Los Angeles, California 90024, United States