Fig. 1. Flow chart of the literature search, screening, and inclusion of the studies. † Total number of the included studies is 10 because there are 8 papers studying the effect of melatonin on both pain and anxiety.
Fig. 1. Flow chart of the literature search, screening, and inclusion of the studies. † Total number of the included studies is 10 because there are 8 papers studying the effect of melatonin on both pain and anxiety.
