TY - JOUR DP - http://iris.who.int/ DB - WHO IRIS EP - 56 AU - World Health Organization LA - en LA - fr UR - https://iris.who.int/handle/10665/215854 JF - Weekly Epidemiological Record = Relevé épidémiologique hebdomadaire DA - 1967 PY - 1967 IS - 04 SP - 45 TI - Weekly Epidemiological Record, 1967, vol. 42, 04 [full issue] VL - 42 ER -