1. The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, Maryland 21205, United States
2. Laboratory of Structural Biology, Institute of Biotechnology of the Czech Academy of Sciences, Prumyslova 595, Vestec 252 50, Czech Republic
3. The James Buchanan Brady Urologic Institute and Department of Urology, Johns Hopkins School of Medicine, 600 N. Wolfe St., Baltimore, Maryland 21287, United States
4. Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, 401 N. Broadway, Baltimore, Maryland 21231, United States