1. Department of Statistics, Brigham Young University, Provo, UT
2. BCAM—Basque Center for Applied Mathematics, Bilbao, Spain
3. Departamento de Estadística, Pontificia Universidad Católica de Chile, Santiago, Chile
4. Millennium Nucleus Center for the Discovery of Structures in Complex Data, Santiago, Chile
5. Department of Mathematics, The University of Texas at Austin, TX