TY - JOUR DP - http://iris.who.int/ DB - WHO IRIS EP - 5 CY - Geneva PP - Geneva C2 - 4865377 LA - en PB - World Health Organization UR - https://iris.who.int/handle/10665/263255 JF - Bulletin of the World Health Organization DA - 1967 PY - 1967 IS - 1 SP - 1 TI - Introduction VL - 36 KW - Articles SN - 0042-9686 ER -