Presurgical invasive mediastinal staging in lung cancer, unexpected N2 and long-term survival: a registry-based study with data from the Spanish group for video-assisted thoracic surgery

Iker López, Borja Aguinagalde, Iratxe Urreta, Iñigo Royo, Sergio Bolufer, Laura Sánchez, Jon Zabaleta, Arantza Fernández-Monge, Raúl Embún; on behalf of the Spanish Group for Video-Assisted Thoracic Surgery (GEVATS)