00641nam a2200181Ia 450000500170000000800410001702000180005803500090007604100080008508200110009310000300010424501670013426000450030130000070034650000090035350500570036265000400041920260808125457.0260808s9999||||xx |||||||||||||| ||und||  a92-4-154236-5  a5846  aENG  a616.39  aWorld Health Organization 0aVitamin a supplementsba guide to their use in the treatment and prevention of vitamin a deficiency and xerophthalia : prepared by WHO / iNicef / ivacg task force  aGenevabWorld Health Oraganizationc1988  a24  aGift  aWHO, international health, pathology, global disease  aWHObPathology -- Internal medicine