1. CPSTF, Community Preventive Services Task Force. Vaccination Programs: Provider Reminders. 2015.
2. CPSTF, Community Preventive Services Task Force. Vaccination Programs: Client Reminder and Recall Systems. 2015.
3. Increasing coverage of appropriate vaccinations a community guide systematic economic review;Jacob;Am J Prev Med,2016
4. Patient reminder and recall interventions to improve immunization rates;Jacobson Vann;Cochrane Database Syst Rev,2018
5. https://www.statista.com/statistics/456500/daily-number-of-e-mails-worldwide/ [Accessed 22.06.2019].