1. Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital; Boston Massachusetts USA
2. Harvard Medical School; Boston Massachusetts USA
3. Institute of Medical Physics and Radiation Protection, THM, Life Science Engineering; Giessen Germany
4. Division of Biomedical Physics; Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration; Silver Spring Maryland USA