Karaca, Omer, and Yilmaz Polat. 2021. “Efficacy of Ultrasound-Guided Bilateral Erector Spinae Plane Block for Postoperative Analgesia in Laparoscopic Sleeve Gastrectomy. A Retrospective Cohort Study”. Annals of Medical Research 27 (10):2719-25. http://www.annalsmedres.org/index.php/aomr/article/view/990.