Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.The authors thank the Head Teachers and school staff, parents, and children in schools in Gem sub-County for their enthusiasm to participate in this study. Field and office staff are thanked for their hard work and diligence. The Director of KEMRI has approved this manuscript.