Zhong N.S., Zheng B.J., Li L.M., Poon L.L.M, Xie Z.H., Chan K.H., Li P.H., Tan S.Y, Chang Q., Xie J.P., Liu X.Q, Xu J., Li D.X., Yuen K.Y., Peiris J.S.M., & Guan Y. (2003). Epidemiology and cause of severe acute respiratory syndrome (SARS) in Guangdong, People's Republic of China, in February, 2003. The Lancet, 362(9393), 1353-1358. https://doi.org/10.1016/S0140-6736(03)14630-2.