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Mechanick JI, ApovianC, Brethauer S, et al. Clinical PracticeGuidelines for the Perioperative Nutrition, Metabolic, and Nonsurgical Support of Patients Undergoing Bariatric Procedures 2019 Update cosponsored by AACE/ACE/TOS/ASMBS/OMA/ASA. Surg Obes Rel Dis. 2020Feb; 16(2) 175-247.