TY - JOUR DP - http://iris.who.int/ DB - WHO IRIS EP - 133 CY - Geneva PP - Geneva LA - en PB - World Health Organization UR - https://iris.who.int/handle/10665/261603 JF - Bulletin of the World Health Organization DA - 1993 PY - 1993 IS - 1 SP - 129 TI - Recent WHO publications VL - 71 KW - Articles SN - 0042-9686 ER -