Mao, B., Liu, Y., Chai, Y., Jin, X., Lu, H., Yang, J., Gao, X., Song, X., Bao, H., Wang, A., Gu, W., Zhao, L., Pan, J., Li, F., Zhang, T., Qian, Y., Du, C., Ding, W., Tu, C., Chu, D., Li, C., Ye, L., Luo, Y., Zheng, C., Yu, R., Qiu, Z., Cao, H., Ren, J., Zhao, J., Wang, C., Lu, H., Li, J., Hu, Y., Liang, S., Jie, Z., Qu, J., & Xu, J. (2020). assessing risk factors for SARS-CoV-2 infection in patients presenting with symptoms in Shanghai, China: a multicentre, observational cohort study. Lancet, 2(6), e323–e330. http://access.bl.uk/ark:/81055/vdc_100103930800.0x000003