2.3 Study selection and quality assessment:
Two authors () individually reviewed the titles and abstracts of the literature extracted from database search. Each author filtered the studies based on the predetermined eligibility criteria. Any conflict was resolved through discussion and an earlier agreement that a third author (AK) would evaluate the differences in opinion. The Newcastle-Ottawa Scale (NOS) was utilized to assess the risk of bias of the included studies. Two authors (KR, RKP) independently performed and reported the Newcastle-Ottawa Scale (NOS), differences resolved by discussion and after consultation with the third author (AK). The studies were categorized as: low bias risk (8-9 points), moderate bias risk (5-7 points), and high bias risk (0-4 points).