“…The authors reported several limitations in their studies, from a lack of objective outcome measures [30,32,33,35,41,[46][47][48]51,53,54,57,59,60] to the selection bias of the participants [29,31,33,36,38,39,43,48,54,55,59], and lack of control groups [30,32,43,49]. A description of the limitations is provided in Table 1.…”