00253nam a2200097Ia 4500080001900000245005800019260002400077300001500101583001900116650002000135  a15.05.01 W9271  aThe selection and use of essential medicines : report  bWHOaGenevaCHc2004  avi, 127 p.  c10/31/06kJOYD  aESSENTIAL DRUGS