To KKW, Zhou J, Song YQ, Hung IFN, Ip WCT, Cheng ZS, Chan ASF, Kao RYT, Wu AKL, Chau S, Luk WK, Ip MSM, Chan KH, Yuen KY. Surfactant protein B gene polymorphism is associated with severe influenza. Chest. 2014 Jun;145(6):1237–43. doi: 10.1378/chest.13-1651. PMID: 24337193.