1. Department of Biomedical Engineering, Rowan University, Glassboro, New Jersey 08028, United States
2. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
3. Department of Physics, Bryn Mawr College, Bryn Mawr, Pennsylvania 19010, United States
4. Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
5. Department of Experimental Physics of Complex Systems, Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342, Krakow, Poland
6. Department of Physics, University of Latvia, Riga LV-1004, Latvia
7. Department of Physiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States