Table 3 Summary of previous meta-analyses and the limitations
Author and year | Case setting | Searching strategy | NS | Limitations |
|---|---|---|---|---|
Liu et al. 2015 [65] | Hypertension | PubMed, EMBASE, ISI Web of Science, Wanfang, and CNKI | 56 | 5 studies had deviation from HWE 25 full texts were not found Data discrepancy was found |
Wang et al. 2010 [64] | EHT | Chinese Biomedicine Database, CNKI, PubMed, and Medline | 30 | 2 studies had deviation from HWE 21 full texts were not found |
Yang et al. 2017 [66] | Hypertension | PubMed and Web of Knowledge | 46 | 3 studies had deviation from HWE 3 full texts were not found |