Question
number 		Refahee et al.
[20] 		Sonane et al.
[21] 		Chang et al.
[22] 		Lu et al.
[23] 		Luthra et al.
[24] 		Nosheen Jan et al.
[25] 		James et al.
[26]
Q1 + + + + + + +
Q2 + + + + N/A ? +
Q3 + + + + + + +
Q4 - - + + - - -
Q5 - - + + - - -
Q6 + + + + N/A ? +
Q7 + + + + + + +
Q8 + - + + + + +
Q9 + + + + + + +
Q10 + + + + + + +
Q11 + + + + + + +
Q12 + + + + + + +
Q13 + + + ? N/A ? +

? = unclear; + = yes; - = no; N/A = not applicable.