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First Online: 15 June 2018

Ethics approval and consent to participate

: This study was part of a bigger research program that involved research with human subjects. Ethical approval for the whole study was obtained from the institutional ethics review committee of University of Montreal Hospital Research Center (Ref. 10.144) and in Burkina Faso (Ref. 2010–073).

: The authors declare that they have no competing interests.

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