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Article History

Received: 8 October 2019

Accepted: 10 December 2019

First Online: 10 February 2020

Ethics approval and consent to participate

: Not applicable. Analysis based on secondary analysis of anonymized data where no individual data could be identified so formal ethical clearance was not required. Permission to use the data were obtained from the organizations collecting the datasets.The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control or of Action Contre la Faim.

: Not applicable.

: All authors declare that they have no competing interests; no support from any organization for the submitted work; no financial relationships with any organizations that might have an interest in the submitted work in the previous 3 years; no other relationships or activities that could appear to have influenced the submitted work.