@ARTICLE{10665-210647, author = {World Health Organization}, journal = {Weekly Epidemiological Record = Relevé épidémiologique hebdomadaire}, title = {Weekly Epidemiological Record, 1956, vol. 31, 24 [full issue]}, volume = {31}, year = {1956}, number = {24}, type = {Journal / periodical articles}, pages = {229 - 238} }