Institution: | 1. Departamento de Estadística e I.O., Universidad de Valladolid, 47011 Valladolid, SpainThese authors contributed equally to the paper;2. Departamento de Estadística e I.O., Universidad de Valladolid, 47011 Valladolid, Spain;3. Department of Statistics, University of Oxford, Oxford, U.K., and Department of Statistics, University of Leeds, Leeds, U.K.;4. Biostatistics and Computational Biology Branch NIEHS (NIH), Research Triangle Park, NC, U.S.A. |