1. Oncology Division, Center for Applied Medical Research (CIMA), University of Navarra, Avda. Pio XII, 55, Pamplona, 31008, Spain. Fax: +34 948 194714; Tel: +34 948 194700 ext. 1000
2. Department of Histology and Pathology, Schools of Medicine and Sciences, University of Navarra, Irunlarrea 1, Pamplona, 31008, Spain