3.2 Study eligibility criteria
The inclusion criteria will be articles that present adult patients and both sexes previously submitted to Roux-en-Y gastric bypass surgery with a containment ring, patients with food intolerance. Articles that present the duration in days of the effective action of plastic or metallic stents to induce ring erosion will also be analyzed, as well as articles that show whether the symptoms have resolved, the success rate of ring removal, the need for endoscopic dilation, adverse events, long-term follow-up for the possibility of weight gain or stenosis formation. Exclusion criteria will be articles that present another procedure for erosion or removal of the ring other than through stents and endoscopic procedures, respectively.