1. From the Department of Pathology, Hospital Clínic of Barcelona, Barcelona, Spain (Frigola, Bühler, Marginet, Alamo, Aldecoa, Campo, Balagué)
2. The Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain (Frigola, Bühler, Enjuanes, Nadeu, Campo, Balagué)
3. The Department of Pathology, University Hospital Zürich, Zürich, Switzerland (Bühler, Haralambieva)
4. The Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Madrid, Spain (Nadeu, Campo, Balagué)
5. The Department of Pathology, Parc Taulí Hospital Universitari, Sabadell, Spain (Papaleo)
6. The Department of Pathology, Hospital del Mar, Barcelona, Spain (Papaleo, Salido, Colomo)
7. The Department of Diagnostic Fundamentals, University Pompeu Fabra, Barcelona, Spain (Papaleo, Colomo)
8. The Department of Pathology, Complejo Hospitalario de Navarra, Pamplona, Spain (Garcia-Bragado)
9. The Department of Pathology, Hospital Universitario Miguel Servet, Zaragoza, Spain (Álvarez)
10. The Department of Pathology, Hospital Universitari Son Espases, Palma de Mallorca, Spain (Ramos)
11. The Department of Clinical Fundamentals, University of Barcelona, Barcelona, Spain (Campo, Balagué)