Data Extraction
Two investigators (S.K and A.A) independently screened records retrieved
from the search by title and abstract. Details such as first author,
year of publication, study design, participant characteristics, age,
sample size, sample stratification, outcome measures, results and
author’s conclusion were collated and examined. Selected records were
further screened for eligibility in full text by the same investigators
(S.K and A.A). Data collection was performed independently by two
investigators (S.K and C.L) using the same pre-determined template.
Discrepancies at any stage of selection were arbitrated by the senior
author (T.C.T) if discussion between all three reviewers failed to
achieve a consensus (S.K, A.A, and C.L).