2Dean AG ,Amer TG,Sunld GG,ct al. Epi Info(tm) ,a database and statistics program for public health professionals. Centers for Disease. Control and Prevention, Atlanta, Georgia, USA,2007.
2Dean AG, Arner TG, Sunki GG, et al. Epi Info (TM), a database and statistics program for public health professionals. 2007, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.