1. Department of Bioengineering, University of California, San Diego, La Jolla, California 92093, USA
2. Department of Mechanical Engineering, San Diego State University, San Diego, California 92182, USA
3. Computational Sciences Research Center, San Diego State University, San Diego, California 92182, USA
4. Sanford Consortium for Regenerative Medicine, La Jolla, California 92037, USA