Author affiliations
1. Baotou Clinical Medical College of Inner Mongolia Medical University, Baotou, China
2. Department of Cardiology, Baotou Central Hospital, Baotou 014040, China
Acknowledgements Our greatest acknowledgement goes to the authors who made detailed data available for this meta-analysis and all our colleagues in this study for their hard work.
Contributors WMH, BH and QL performed the search and drafted the manuscript. WMH and YHZ performed the data extraction and analysed the data. WMH, WL and YHZ designed the study and amended the original draft.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
Data availability statement All data relevant to the study are included in the article or uploaded as supplementary information.
ORCID iD Weimin Huanghttps://orcid.org/0000-0003-2556-6214