@article{zhu_xiong_ding_chen_li_zhou_xu_2017,  title={Comparison of outcomes between off-pump versus on-pump coronary artery bypass surgery in elderly patients: a meta-analysis},  volume={50},  ISSN={0100-879X},  url={https://doi.org/10.1590/1414-431X20165711},  DOI={10.1590/1414-431X20165711},  number={3},  journal={Brazilian Journal of Medical and Biological Research},  publisher={Associação Brasileira de Divulgação Científica},  author={Zhu, Z.G. and Xiong, W. and Ding, J.L. and Chen, J. and Li, Y. and Zhou, J.L. and Xu, J.J.},  year={2017},  pages={e5711} }