1. Department of Statistics, Computer Science, and Mathematics, Public University of Navarre, Campus de Arrosadia, 31006 Pamplona, Spain and Institute Institute for Advanced Materials and Mathematics (INAMAT2), Campus de Arrosadia, 31006 Pamplona, Spain
2. Department of Statistics, Computer Science, and Mathematics, Public University of Navarre, Campus de Arrosadia, 31006 Pamplona, Spain and Institute Institute for Advanced Materials and Mathematics (INAMAT2), Campus de Arrosadia, 31006 Pamplona, Spain and IdiSNA, Health Research Institute of Navarre Recinto de Complejo Hospitalario de Navarra C/ Irunlarrea, 3 31008 Pamplona, Spain