Meyer DC, Hill SS, Pavao R, Resnick AJ, Purkayastha A, Davids JS, Sturrock PR, Maykel JA, Alavi K. Prospective Evaluation of a Tiered Opioid Prescribing Guideline for Inpatient Colorectal Operations. Ann Surg. 2023 03 01; 277(3):e561-e568.