1 Imaging Research Laboratories, Robarts Research Institute, Western University, 1151 Richmond St., London, ON, N6A 3K7, Canada.
2 Mitsuishi-Suita Lab, Department of Bioengineering/Mechanical Engineering, School of Engineering, The University of Tokyo, Eng. Bldg 2-71C1, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
3 ARTORG Research Center Biomedical Engineering, University of Bern, Murtenstrasse 50, 3008, Bern, Switzerland. raphael.sznitman@artorg.unibe.ch.