1. Research Unit, University General Hospital of Alicante, Alicante, Spain
2. Pathology Department, Hospital de Cruces, Barakaldo, Spain
3. Epidemiology Department, University General Hospital of Alicante, Alicante, Spain
4. Pathology Department, University General Hospital of Alicante, Alicante, Spain
5. Pathology Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.