1. UNICEF . Data from: maternal and newborn health coverage database, 2022. UNICEF. Available: https://data.unicef.org/topic/maternal-health/antenatal-care/ [Accessed Sep 2022].
2. WHO, UNICEF, UNFPA, World Bank Groupand UNPD . Data from: trends in estimates of maternal mortality ratio (MMR; maternal deaths per 100,000 live births) maternal deaths and lifetime risk of maternal death, 2000-2017. Geneva WHO; 2019. https://data.unicef.org/topic/maternal-health/maternal-mortality/ [Accessed Dec 2021].
3. Smartphone ownership is growing rapidly around the world, but not always equally. Available: https://www.pewresearch.org/global/2019/02/05/smartphone-ownership-is-growing-rapidly-around-the-world-but-not-always-equally/ [Accessed Feb 2022].
4. World Health Assembly . mHealth: use of appropriate digital technologies for public health: report by the director-general World Health Organization; 2018. https://apps.who.int/iris/handle/10665/276430 [Accessed Mar 2022].
5. mHealth interventions in low-income countries to address maternal health: a systematic review;Colaci;Ann Glob Health,2016