@ARTICLE{10665-223512, author = {World Health Organization}, journal = {Weekly Epidemiological Record = Relevé épidémiologique hebdomadaire}, title = {Weekly Epidemiological Record, 1981, vol. 56, 22 [full issue]}, volume = {56}, year = {1981}, number = {22}, type = {Journal / periodical articles}, pages = {169 - 176} }