Table 1.

Ottawa rating for included studies: (* OR ** means criteria fulfilled/maximum score = 9)

Study	Selection	Comparability	Outcomes	Total
Adewale et al.	****	**	**	8
Ahenkorah et al.	****	**	***	9
Ajanga et al.	****	**	***	9
Alem et al.	***	**	***	8
Anchang-Kimbi et al.	****	**	**	8
Ayoya et al.	****	**	**	8
Bolka et al.	****	**	**	8
Coulibaly et al.	****	**	***	9
Derso et al.	****	**	***	9
Egwunyenga et al.	****	**	**	8
Eyo et al.	****	**	**	8
Fairley et al.	****	**	***	9
Feleke et al.	****	**	**	8
Fuseini et al.	****	**	**	8
Gadoth et al.	****	**	***	9
Gedefaw et al.	****	**	**	8
Kawai et al.	***	**	***	8
Kefiyalew et al.	***	**	**	7
Khalid et al.	***	**	***	8
Kihara et al.	****	**	***	9
Mombo-Ngoma et al.	****	**	**	8
Muhangi et al.	****	**	***	9
Murenjekwa et al.	****	**	**	8
Ndyomugyenyi et al.	****	**	**	8
Ouédraogo et al.	****	**	***	9
Oyeyemi et al.	****	**	***	9
Salawu et al.	****	**	**	8
Siegrist et al.	****	**	**	8
Tay et al.	****	**	***	9
Thigpen et al.	****	**	**	8
Tonga et al.	***	**	***	8
Wepnje et al.	****	**	**	8