Performance of endobronchial ultrasound transbronchial needle aspiration as the first nodal staging procedure for the determination of programmed death ligand-1 expression in non-small cell lung cancer patients

1. Polanco, D.
2. Pinilla, L.
3. Gracia-Lavedan, E.
4. Gatius, S.
5. Zuil, M.
6. Pardina, M.
7. Gómez, S.
8. Barbé, F.