Zhong, Y.; Zhou, Q.; Zhang, Y.; Zhou, S.; Zhang, G.; Jiang, C.; Zhang, Z.; Zhang, X.; Xu, J.; Jin, C.; Cao, L.; Chen, L. Cell-Free DNA As a Biomarker for Colorectal Cancer: A Retrospective Analysis in Patients before and After Surgery. Cell Mol Biol (Noisy-le-grand) 2020, 66, 135-141.