6.

Kurdi et al. (2016) [18]

NR

NR

NR

NR

7.

Alhunaishel et al. (2016) [19]

<14 years

27

26

91

8.

Al-Anazi et al. (2017) [20]

12 months

85

125

40

9.

Al-Mohrej et al. (2017) [21]

3 months

50

44

88

10.

Assaf (2018) [22]

<24 months

72

92

60