1. Institute for Bioscience and Biotechnology Research of the University of Maryland and the Biomolecular Measurement Division, National Institute of Standards and Technology, Rockville, Maryland 20850, United States
2. Statistical Engineering Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
3. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
4. Department of Biochemistry and Molecular Biology, Wright State University, Dayton, Ohio 45435, United States