“…However, the effects of the intervention vary depending on the health care setting. In a clustered randomized study based largely in Planned Parenthood clinics, reminder messages based on study subject's preferred method (including text, e-mail, phone, private Facebook message, or standard mail) did not increase the series completion rate [19]. In three nonrandomized studies based on academic or private pediatric clinics, text message or automated phone reminders were generally effective in increasing the uptake of subsequent doses of HPV vaccine.…”