1. Institute of High Energy Physics, Chinese Academy of Science, 100049 Beijing, China
2. Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
3. Queen Mary University of London, Institute of Bioengineering and School of Engineering and Material Science, E1 4NS London, U.K.
4. Diamond Light Source, Harwell Science and Innovation Campus, OX11 0DE Harwell, U.K.