Is invasive mediastinal staging necessary in intermediate risk patients with negative PET/CT?

Marc Boada, David Sánchez-Lorente, Alejandra Libreros, Carmen M. Lucena, Ramón Marrades, Marcelo Sánchez, Pilar Paredes, Mario Serrano, Angela Guirao, Rudith Guzmán, Núria Viñolas, Francesc Casas, Carles Agustí, Laureano Molins