title: When randomized trials and observational data disagree: the case of preoperative versus postoperative chemoradiotherapy for esophageal cancer.
authors.forename: David A
authors.initials: DA
authors.lastname: Palma
authors.forename: George B
authors.initials: GB
authors.lastname: Rodrigues
authors.forename: Richard
authors.initials: R
authors.lastname: Malthaner
mesh_terms: D000230:Adenocarcinoma / Q000401:mortality* / Q000532:radiotherapy*; D002294:Carcinoma, Squamous Cell / Q000401:mortality* / Q000532:radiotherapy*; D004938:Esophageal Neoplasms / Q000401:mortality* / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D008297:Male