TY - JOUR DP - http://iris.who.int/ DB - WHO IRIS EP - 176 AU - World Health Organization LA - en LA - fr UR - https://iris.who.int/handle/10665/230485 JF - Weekly Epidemiological Record = Relevé épidémiologique hebdomadaire DA - 1998 PY - 1998 IS - 23 SP - 169 TI - Weekly Epidemiological Record, 1998, vol. 73, 23 [full issue] VL - 73 ER -