Table 1.

Risk of bias.

Author	Q1	Q2	Q3	Q4	Q7	Q8	Risk bias
Aneesh	*	*	*	*	*	*	Low
Farmahan S	*	*	*	*	*	*	Low
Nils Heim	*	*	*	*	*	*	Low
Inderdeep Singh Walia	*	*	*	*	*	*	Low
López - González E	*	*	*	*	*	*	Low
Mamta Singh	*	*	*	*	*	*	Low
Narita M	*	*	*	*	*	*	Low
Heim N.	*	*	*	*	*	*	Low
Adamson OO	*	*	*	*	*	*	Low
Plum A.	*	*	*	*	*	*	Low
Sánchez R	*	*	*	*	*	*	Low
Rasteniene R.	*	*	*	*	*	*	Low
Kityamuwesi R.	*	*	*	*	*	*	Low

Scientific papers included in the study.