Department of Statistics, Rice University, Houston, TX, USA.|ESOMAS Department, University of Torino and Collegio Carlo Alberto, Torino, Italy.|Department of Statistics, University of California, Irvine, CA, USA.|Department of Infectious Disease, Infection Control, and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, 77030, TX, USA.|Department of Genomic Medicine, The University of Texas MD Anderson Cancer Center, Houston, 77030, TX, USA.|Department of Statistics, Rice University, Houston, TX, USA. marina@rice.edu.