Winai Sirichativapee2011-02-242011-02-242010-05-132010-05-13Srinagarind Medical Journal (SMJ); Vo. 6 No. 2 April - June 1991; 131-138http://imsear.searo.who.int/handle/123456789/133885no abstracten-USAcademic Affairs, Faculty of Medicine, Khon Kaen University, KhonKaen, ThailandReview Articles