Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu|Institute for Genome Sciences and Policy, Duke University, Durham, NC, USA. joe@stat.duke.edu