1. Medically Advanced Devices Laboratory, Center for Medical Device Engineering and Biomechanics, Department of Mechanical and Aerospace Engineering, Jacobs School of Engineering, University of California San Diego, La Jolla, California 92093-0411, United States
2. Materials Science and Engineering Program, Jacobs School of Engineering, University of California San Diego, La Jolla, California 92093-0411, United States
3. Department of Surgery, School of Medicine, University of California San Diego, La Jolla, California 92093, United States