Erol, V., B. Arslan, B. Tuncali, Y. Ozvardar Pekcan, C. Altin, T. Han Yilmaz, and H. Gulay. “Benefits and Reliability of Laparoscopic Sleeve Gastrectomy in Patients Aged 60 Years and Older”. Annals of Medical Research, vol. 26, no. 3, May 2021, pp. 0485-8, http://www.annalsmedres.org/index.php/aomr/article/view/1320.