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