“EFFICACY OF ULTRASOUND-GUIDED OBLIQUE SUBCOSTAL TRANSVERSUS ABDOMINIS PLANE BLOCK (OSTAP BLOCK) WITH ROPIVACAINE FOR POSTOPERATIVE ANALGESIA IN LAPAROSCOPIC CHOLECYSTECTOMY – A PROSPECTIVE OBSERVATIONAL STUDY”. (2024) Journal of Population Therapeutics and Clinical Pharmacology, 31(9), pp. 623–631. doi:10.53555/3nemb660.