Zhang, D. ., Tian, X. ., Feng, R. ., Guo, X. ., Wang, P. ., Situ, Y. ., … Xu, K. . (2018). Secondary pulmonary alveolar proteinosis: a single-center retrospective study (a case series and literature review). BMC Pulmonary Medicine, 18(1), 15. https://doi.org/10.1186/s12890-018-0590-z (Original work published 2018)