“…The chart method was used to confirm the accuracy of each article's title, abstract, introduction, rational for the report, research question(s), design, inclusion and exclusion criteria, subject selection method, subjects' missing status, where and when the study was performed, data collection, measurements and statistics, results, implications and limitations, conclusions, ethical considerations, and internal and external validity of the study. The quality ratings adhered to the following strict principles: high‐quality studies fulfilled 90% of 30 criteria 26‐28 moderate‐quality studies fulfilled 80% of 30 criteria, 23‐25 low‐quality studies fulfilled 70% of 30 criteria, 20‐22 and studies with insufficient quality fulfilled ≤69% of 30 criteria (ie, ≤20 criteria) (Table 1).…”