Serna López Ángela M, Donado Gómez JH, Giraldo Villa A, et al. Preoperative Psychological Conditions and Their Effect on Weight Loss During the First 18 Months Post-Surgery in Obese Patients Undergoing Gastric Bypass. Med UPB. 2014;33(2):106-116. Accessed August 9, 2026. https://revistas.upb.edu.co/index.php/medicina/article/view/1400