Sarmiento, Annie Jane, et al. “A Randomized Controlled Trial on the Effectiveness of Short Message Service (SMS) Reminders in Improving Postpartum Follow-up Among Gestational Diabetes Mellitus Patients”. Journal of the ASEAN Federation of Endocrine Societies, vol. 34, no. 1, July 2019, p. 62, doi:10.15605/jafes.034.01.10.