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The Obesity Surgery Mortality Risk Score (OS-MRS) has been proposed as a user-friendly tool for the assessment and risk stratification of patients undergoing Roux-en-Y gastric bypass (RYGB). We assessed the validity of the OS-MRS in 2121 primary RYGB procedures performed at our center during a 25-year period.A retrospective study of the patients who had undergone primary RYGB since 1983 was performed...
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