Study Characteristics
The systematic review resulted in 806 articles with 351 screened after
duplicates were removed (Figure 1). Following the criteria described
above, a total of 305 studies were excluded. Forty-six full-text
articles were assessed. Among them, 26 were excluded as they conducted
adjuvant therapy studies and did not provide relevant outcomes. Twenty
different studies fulfilled the predefined inclusion criteria. The main
details of the included articles are shown in Table 1.
No randomized control trials were available to be included in this
review. Two studies met the criteria as good quality studies. The
remaining 18 studies were of poor quality(Table 2.).