1. Department of Surgery and Medical-Surgical Specialties, Medicine and Dentistry School, University of Santiago de Compostela, Santiago de Compostela, Spain;
2. Liquid Biopsy Analysis Unit, Translational Medical Oncology (Oncomet), Health Research Institute of Santiago (IDIS), Santiago de Compostela, Spain;
3. Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Instituto de Salud Carlos III, Madrid, Spain;
4. Methodology and Statistics Unit, Galicia Sur Health Research Institute (IISGS), Vigo, Spain;
5. Department of Preventive Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain;
6. Consortium for Biomedical Research in Epidemiology and Public Health (CIBER en Epidemiología y Salud Pública-CIBERESP), Santiago de Compostela, Spain;
7. Translational Medical Oncology (Oncomet), Health Research Foundation Institute of Santiago (IDIS,), Complexo Hospitalario Universitario de Santiago de Compostela (SERGAS), Santiago de Compostela, Spain;
8. Oral Sciences Research Group, Health Research Institute of Santiago (IDIS), Santiago de Compostela, Spain