Altintas Y, Bayrak M. Pre-operative work-up before bariatric surgery: Should ultrasonography and upper gastrointestinal endoscopy be done routinely? . annalsmedres [Internet]. 2021 May 25 [cited 2024 May 19];26(3):0408-12. Available from: http://www.annalsmedres.org/index.php/aomr/article/view/1336