@article{liu_zhou_tao_huang_zhu_yu_zhang_2021,  title={COVID-19 vaccine hesitancy among Chinese residents under the free vaccination policy},  volume={67},  ISSN={0104-4230},  url={https://doi.org/10.1590/1806-9282.20210633},  DOI={10.1590/1806-9282.20210633},  number={9},  journal={Revista da Associação Médica Brasileira},  publisher={Associação Médica Brasileira},  author={Liu, Huan and Zhou, Zhiqing and Tao, Xiubin and Huang, Long and Zhu, Ergang and Yu, Liang and Zhang, Ming},  year={2021},  month={Sep},  pages={1317–1321} }