1. Department of Radiology, Harvard Medical School and Brigham and Women's Hospital, Boston, Massachusetts 02115; Laboratory of Nuclear Medicine, Department of Clinical and Experimental Medicine, University of Ferrara, Ferrara 44100, Italy; Institute of Bioinorganic and Radiopharmaceutical Chemistry, Research-Center Rossendorf, Dresden, Germany; Department of Nuclear Medicine, University of Heidelberg, Heidelberg, Germany; and Department of Inorganic Chemistry, Massachusetts Institute of Technology,...