Developing national emergency prevention systems for transboundary animal diseases : report of the FAO Expert Consultation on Development of the Emergency Prevention System for Transboundary Animal and Plant Pests and Diseases (EMPRES) (Livestock Diseases Programme) and review of the Global Rinderpest Eradication Programme (GREP), Rome, Italy, 14-16 July 1997. (FAO animal production and health paper ; 137)