1. Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
2. Paul Scherrer Institut, CH-5232 Villigen, Switzerland
3. X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
4. Center for Cellular Imaging and NanoAnalytics, Biozentrum, University of Basel, CH-4058 Basel, Switzerland