Table 3.

STROBE guide.

	Cornejo et al., 2013 [30]	Wu et al., 2013 [29]	Chaloupka et al., 2014 [36]	Nejad et al., 2014 [24]	Onigbind e et al., 2014 [25]	Soroye et al., 2016 [31]	Ibrahim et al., 2016 [32]	Geevarg Hese et al., 2017 [33]	Corchuel o- Ojeda et al., 2017 [34]	Kateeb et al., 2018 [9]
1	✓	X	✓	✓	✓	✓	✓	✓	✓	✓
2	X	✓	X	✓	X	X	✓	✓	✓	✓
3	✓	X	✓	✓	X	✓	✓	✓	✓	✓
4	X	✓	✓	✓	X	✓	X	✓	X	X
5	✓	✓	✓	✓	✓	✓	X	✓	X	✓
6	✓	X	X	✓	✓	X	✓	✓	X	X
7	✓	✓	✓	X	✓	✓	✓	✓	✓	✓
8	✓	✓	✓	X	✓	✓	✓	✓	✓	✓
9	✓	✓	X	✓	✓	✓	✓	✓	X	✓
10	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓
11	✓	✓	✓	✓	✓	✓	✓	✓	✓	✓
Total risk of bias	9 Low	8 Low	8 Low	9 Low	8 Low	9 Low	9 Low	11 Low	7 Moderate	9 Low