“…Of the 32 studies included , 20 were systematic reviews with meta-analysis [36][37][38]41,44,46,49,50,53,54,56,57,[59][60][61][62][63][64][65][66] and 12 without meta-analysis [35,39,40,42,43,45,47,48,51,52,55,58]. The 32 systematic reviews included 642 studies that met the eligibility criteria of this umbrella review, in particular, 248 case-control studies, 29 cohort studies, 20 cross-sectional studies, 10 non-randomized studies, 2 retrospective cross-sectional studies, 1 cross-sectional cohort study, 1 prospective study, and 331 articles where the study design had not been defined.…”