1. David B. Dunson is Senior Investigator, Biostatistics Branch, National Institute of Environmental Health Sciences, P.O. Box 12233, Research Triangle, Park, NC 27709 . Ya Xue is Computer Scientist, Industrial Artificial Intelligence Laboratory, GE Global Research, One Research Circle K1-4A6, Niskayuna, NY 12309 . Lawrence Carin is William H. Younger Professor, Department of Electrical & Computer Engineering, Pratt School of Engineering, Duke University, Durham, NC 27708 .