Carter, R C
Kupka, R
Manji, K
McDonald, C M
Aboud, S
Erhardt, J G
Gosselin, K
Kisenge, R
Liu, E
Fawzi, W
Duggan, C P
Article History
Received: 12 November 2016
Revised: 9 June 2017
Accepted: 26 July 2017
First Online: 6 September 2017
Competing interests
: Juergen Erhardt is the owner of the company VitMin Lab (Willstaett, Germany), where some of the assays performed in this study were conducted. Roland Kupka is a UNICEF staff member. The remaining authors declare no conflict of interest.