Vilaychone, R.- korn, T. Ratanachu-ek, V. Boonpucknavig, W. Poungwongkhan, and W. Charoensuk. “Virtual Gastroscopy and Endoscopic Ultrasonic Scan (EUS)”. The Bangkok Medical Journal, vol. 1, no. 1, Feb. 2018, p. 119, doi:10.31524/bkkmedj.2011.02.019.