A limitation to the study was the use of key informants who were thought to be the most knowledgeable in their country but who might have come from differing perspectives. For a few countries multiple responses were obtained. In these cases, the information provided was reviewed and the most internally consistent response was incorporated into the survey database. Concern with the low response rate was discussed with WHO’s network of experts in this area and others involved in this type of studies. WHO was advised that it is particularly dif- fi cult to obtain responses in the area of child and.
