1. Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742, United States
2. School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
3. Biological Physics Group, Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
4. Cornell High Energy Synchrotron Source (CHESS), Cornell University, Ithaca, New York 14853, United States
5. Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States