Literature search and study characteristics
Literature search of various databases yielded a total of 360 citations
which were imported on a citation manager. Of these 107 duplicate
articles were removed and other 178 articles were removed after initial
title and abstract screening due to various reasons (Figure 1).
Seventy-five articles were selected for full text review. For final
analysis 50 articles were included and remaining 25 articles were
excluded due to non randomized nature of studies.