TY - JOUR DP - http://iris.who.int/ DB - WHO IRIS EP - 220 AU - World Health Organization LA - es UR - https://iris.who.int/handle/10665/233118 JF - Weekly Epidemiological Record = Relevé épidémiologique hebdomadaire DA - 2006 PY - 2006 IS - 21 SP - 209 TI - Weekly Epidemiological Record, 2006, vol. 81, 21 [full issue] VL - 81 ER -