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Article History

Received: 1 June 2017

Accepted: 5 December 2017

First Online: 9 February 2018

Ethics approval and consent to participate

: Data used for the study did not include any personal identifiers. The study was ethically approved by the Malawi National Health Science Research Committee in Lilongwe, Malawi. As the study used routine program data, the ethics board provided a waiver of individual informed consent.

: Not applicable.

: The authors declare that they have no competing interests.

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