00562nam a2200181Ia 450000500170000000800410001702000180005803500090007604100080008508200100009310000300010324500890013326000450022230000070026750000090027450500570028365000400034020260808125503.0260808s9999||||xx |||||||||||||| ||und||  a92-4-121006-0  a6100  aENG  a616.9  aWorld Health Organization 0aPrevention of sexual transmission of human immunodeficiency virusbWHO AIDS series 6  aGenevabWorld Health Oraganizationc1990  a27  aGift  aWHO, international health, pathology, global disease  aWHObPathology -- Internal medicine