1. Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, Ontario, Canada
2. Department of Statistics, Harvard University, Cambridge, MA, USA
3. Department of Physics and Astronomy, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
4. Department of Mathematics, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
5. Path BioAnalytics Inc., Chapel Hill, NC, USA
6. Department of Mathematics, University of South Carolina, Columbia, SC, USA
7. Department of Mathematics, Tulane University, New Orleans, LA, USA