Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Luo, H and Xu, R(2020). Isolation and methylation profiling of cfDNA. Bio-protocol Preprint. bio-protocol.org/prep245.
Luo, H., Zhao, Q., Wei, W., Zheng, L., Yi, S., Li, G., Wang, W., Sheng, H., Pu, H., Mo, H., Zuo, Z., Liu, Z., Li, C., Xie, C., Zeng, Z., Li, W., Hao, X., Liu, Y., Cao, S., Liu, W., Gibson, S., Zhang, K., Xu, G. and Xu, R.(2019). Circulating tumor DNA methylation profiles enable early diagnosis prognosis prediction and screening for colorectal cancer . Science Translational Medicine 12(524). DOI: 10.1126/scitranslmed.aax7533