Among the observational studies, twenty-three were cross-sectional studies [20, 21, 23, 25, 27,28,29, 31,32,33,34, 38,39,40, 42,43,44,45, 47, 48, 50, 51, 53], six were case-control studies [35, 36, 41, 52, 54, 55], six were cohort studies [12, 22, 26, 30, 37, 49], and one was a case-series [24] study
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