Ethical considerations
The study protocols were approved by Cameroon’s National Ethics Committee for Human Subjects Research, the National d’Ethique de la Recherche pour la Humaine (CNERSH; decision no. 2019/08/1183/CE/CNERSH/SP). The study also received administrative authorization from the Ministry of Health’s [Min Division of Health Operations Research (DROS; decision no. D30- 760/L/MINSANTE/SG/DROS)]. Last, the protocols were also approved by our own institutional review board (decision no. 780/CIERSH/DM/2018). The adaptive experiment, which followed this study, is registered at the American Economic Association's registry for randomized trials and can be accessed at the following link: 