Lertsithichai, P. . “29th Annual Congress of the Royal College of Surgeons of Thailand, 31 July – 2 August 2004”. The Thai Journal of Surgery, vol. 25, no. 3, Sept. 2004, pp. 91-112, https://he02.tci-thaijo.org/index.php/ThaiJSurg/article/view/242414.