Prospective randomized controlled trials: when the gold in the gold standard isn't pure.
Koretz
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RL
D005770:Gastrointestinal Neoplasms / Q000401:mortality / Q000601:surgery; D006801:Humans; D010289:Parenteral Nutrition, Total; D011300:Preoperative Care; D011446:Prospective Studies; D016032:Randomized Controlled Trials as Topic / Q000592:standards*