1. Department of Medicine and Medical Specialties, Faculty of Medicine and Health Sciences, University of Alcalá, 28801 Alcala de Henares, Spain
2. Oncology Service, Guadalajara University Hospital, 19002 Guadalajara, Spain
3. Ramón y Cajal Institute of Sanitary Research (IRYCIS), 28034 Madrid, Spain
4. Ramón y Cajal Institute of Sanitary Research (IRYCIS), 28034 Madrid