Harungsri, Natthaporn. 2023. “The Relationship Between Abdominal Circumference and Intravenous Ephedrine Dose During Elective Cesarean Section under Spinal Anesthesia”. Krabi Medical Journal 5 (2):17-25. https://he01.tci-thaijo.org/index.php/KBJ/article/view/261040.