[1] Department of Applied Mathematics and Statistics, Johns Hopkins University, Baltimore,MD,2128, United States
[2] Center for Imaging Science, Johns Hopkins University, Baltimore,MD,21218, United States
[3] Department of Biomedical Engineering, Johns Hopkins University, Baltimore,MD,21218, United States
[4] Department of Statistics, University of Michigan, Ann Arbor,MI,48109, United States
[5] Department of Mathematics and Statistics, University of Massachusetts Amherst, MA,01003-9305, United States
[6] Department of Operations, Business Analytics, and Information Systems, College of Business University of Cincinnati, Cincinnati,OH,45221-0211, United States
[7] Department of Mathematics and Statistics, Boston University, Boston,MA,02215, United States