RT Journal Article SR Electronic T1 Ultrasound-guided subcostal-posterior transversus abdominis plane block for pain control following laparoscopic sleeve gastrectomy JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 532 OP 533 DO 10.15537/smj.2018.5.22691 VO 39 IS 5 A1 Alabassi, Abdulla YR 2018 UL http://smj.org.sa/content/39/5/532.abstract AB