Postoperative morbidity after anatomical lung resections by VATS vs thoracotomy: Treatment and intention-to-treat analysis of the Spanish Video-Assisted Thoracic Surgery Group Sara Fra-Fernández; Gemma María Muñoz-Molina; Alberto Cabañero-Sánchez; Laura del Campo-Albendea; Sergio Bolufer-Nadal; Raúl Embún-Flor; Néstor J. Martínez-Hernández; Nicolás Moreno-Mata;