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1
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Li Chen (2016)
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The intervention was EPI application and text reminder sent for both groups
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2
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Wakadha et al. (2013)
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It was a feasibility study with no comparison group of standard care
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3
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Uddin et al. (2016)
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It was quasi-experimental study where the outcome was measured pre and post intervention in both groups
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4
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Schlumberger et al. (2015)
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The abstract was in English but full document was in French. Though the author was contacted but unable to get the English version of the full text
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5
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Abramson et al. (1995)
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Interventions were reminder cards and phone calls
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6
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Morgan et al. (1998)
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Interventions were telephone call and mailed reminders
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7
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Aragones et al. (2015)
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Population includes children above 5 years of age
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8
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Bjornson et al. (1999)
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Interventions were mailed reminders
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9
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Kempe et al. (2015)
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It was a pragmatic trial with interventions mail and autodialed telephone calls
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10
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Stockwell et al. (2015)
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Population extends above 5 years (6 months up to 8 years) with no disaggregation for under-five children
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11
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Zhou-Chen et al. (2008)
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Outcome was improving attendance rates at a health promotion center
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12
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Macknin et al. (2000)
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Population extends beyond under 5 years (0–18 years) and no separate data for children
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13
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Sther–Geen et al. (1993)
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Interventions were voice calls
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14
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Hofstetter et al. (2015)
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Population beyond under 5 years (6 months to 17 years) with educational and interactive messages
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15
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Lieu et al. (1998)
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The study did not randomize patients to no intervention group
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16
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Dombkowski et al. (2014)
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Intervention was mailed recall and reminder
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17
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O’Leary et al. (2015)
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Population was adolescents without under-five children
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18
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Irigoyen et al. (2000)
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Interventions were phone calls and post card reminders
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