Altintas, Yasemin, and Mehmet Bayrak. “Pre-Operative Work-up before Bariatric Surgery: Should Ultrasonography and Upper Gastrointestinal Endoscopy Be Done Routinely?”. Annals of Medical Research 26, no. 3 (May 25, 2021): 0408–0412. Accessed July 22, 2024. http://annalsmedres.org/index.php/aomr/article/view/1336.