Acknowledgements
We would like to thank the Ghana Education Service in the Mion District, the Ghana Health Services (Mion District), all the communities, the girls and their parents who participated in the Ten2Twenty-Ghana Research Project. We are grateful to Saskia J.M. Osendarp of Micronutrient Forum for her input and support during the design of the study. Our sincerest appreciation to the Ten2Twenty-Ghana Field team (Emmanuel, Kennedy, Ambrose, Salifu, Solomon, the two Fauzias, Esther, Millicent, Jennifer, Justina, Salamatu, Salimatu, Feruza, Hamida, Ukashetu, Azaratu and Huzeifa) for their enthusiasm and commitment. Lastly, our gratitude to all MSc students from Wageningen UR (Vera Bunt, Judith ten Have, Adjoa A. Amoafo, Kris Woltering, Joseph Collins Kodom, Betül Uyar, Welmoed Sprong and Rosil Hesen) who assisted us at different time points in the field.This study was part of a completed PhD project of the first author, funded by the Edema-Steernberg Foundation, Judith Zwartz Foundation, Nutricia Foundation and Sight and Life Foundation.Conceived and designed the study: I. D. B. and F. A. Contributed to the survey tools: A.-R. A. and E. J. M. F. Conducted the fieldwork: F. A. and A.-R. A. F. A. conducted the statistical analyses and wrote the first draft of the manuscript with inputs from I. D. B. and H. V. Contributed to the writing of the manuscript: I. D. B., H. V. and E. J. M. F. Primary responsibility for the final content: F. A., I. D. B. and E. J. M. F. All contributing authors and supervisors in the research project read and approved the final manuscript.The authors, investigators and supervisors involved in the design and implementation of this study declare no competing interests.