Poonsri Rangseekajee2011-02-242011-02-242010-04-242010-04-24Srinagarind Medical Journal (SMJ); Vo. 14 No. 1 January - March 1999; 46-49http://imsear.searo.who.int/handle/123456789/133647no abstracten-USAcademic Affairs, Faculty of Medicine, Khon Kaen University, KhonKaen, ThailandReview Articles