Lau CQ, Cronberg A, Marks L, Amaya A. In Search of the Optimal Mode for Mobile Phone Surveys in Developing Countries. A Comparison of IVR, SMS, and CATI in Nigeria. SRM [Internet]. 2019 Dec. 10 [cited 2025 Apr. 3];13(3):305-18. Available from: https://ojs.ub.uni-konstanz.de/srm/article/view/7375