TY - JOUR A1 - Sánchez-Páez, D.A. A1 - Masquelier, B. A1 - Menashe-Oren, A. A1 - Ololade, J. A1 - Reniers, G. T1 - Measuring under-5 mortality and fertility through mobile phone surveys: an assessment of selection bias in 34 low-income and middle-income countries Y1 - 2023 DO - 10.1136/bmjopen-2023-071791 VL - 13 ER -