1. Department of Statistics, University of Connecticut, USA
2. Department of Applied Mathematics and Statistics, Universidade of São Paulo, Brazil
3. Department of Statistics, Pontificia Universidad Católica de Chile, Santiago, Chile
4. Millennium Nucleus Center for the Discovery of Structures in Complex Data, Santiago, Chile
5. Centro de Riesgos y Seguros UC, Pontificia Universidad Cat´ olica de Chile, Santiago, Chile