Chaiyut Thanapaisal2011-02-242011-02-242010-04-182010-04-18Srinagarind Medical Journal (SMJ); Vo. 14 No. 4 October-December 1999; 279-282http://imsear.searo.who.int/handle/123456789/133610no abstracten-USAcademic Affairs, Faculty of Medicine, Khon Kaen University, KhonKaen, ThailandReview Articles