Author contribution
The authors’ responsibilities were as follows—Malekahmadi M and Soltani S: designed the study; Pahlavani N and Malekahmadi M: screened and selected the trials; Pahlavani N, Firouzi S and Rezaei S: extracted the data; Pahlavani N and Firouzi S assessed the risk of bias; Soltani S: analyzed the data; Malekahmadi M: drafted the manuscript; Soltani S, Moradi Moghaddam O and Islam SMS: modified the final manuscript; and all authors: read and approved the final manuscript.