1. Department of Thoracic Surgery, University Hospital Puerta de Hierro-Majadahonda, Manuel de Falla, Madrid, Spain
2. Department of Pathology, University Hospital Puerta de Hierro-Majadahonda, Manuel de Falla, Madrid, Spain
3. Department of Experimental Surgical Research, University Hospital Puerta de Hierro-Majadahonda, Manuel de Falla, Madrid, Spain
4. Department of Statistic, University Hospital Puerta de Hierro-Majadahonda, Manuel de Falla, Madrid, Spain