1. Department of Biological & Environmental Engineering, Cornell University, Ithaca, NY 14853 (USA), Fax: (+1) 607‐255‐4080 http://luolabs.bee.cornell.edu
2. Cornell High Energy Synchrotron Source (USA)
3. Department of Theoretical and Applied Mechanics, Cornell University (USA)
4. National Synchrotron Radiation Laboratory, University of Science and Technology of China (P.R. China)