title: Surgery or radiotherapy for early-stage lung cancer--a potential comparison bias.
authors.forename: Paul E
authors.initials: PE
authors.lastname: Van Schil
authors.forename: Jan
authors.initials: J
authors.lastname: Van Meerbeeck
mesh_terms: D017115:Catheter Ablation; D055088:Early Detection of Cancer; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis*; D011013:Pneumonectomy; D016634:Radiosurgery