1. Siegel RL, Miller KD, Jemal A (2019) Cancer statistics, 2019. CA Cancer J Clin 69 (1):7-34. https://doi.org/10.3322/caac.21551
2. Keum N, Giovannucci E (2019) Global burden of colorectal cancer: emerging trends, risk factors and prevention strategies. Nature reviews Gastroenterology & hepatology 16 (12):713-732. https://doi.org/10.1038/s41575-019-0189-8
3. Virostko J, Capasso A, Yankeelov TE, Goodgame B (2019) Recent trends in the age at diagnosis of colorectal cancer in the US National Cancer Data Base, 2004-2015. Cancer 125 (21):3828-3835. https://doi.org/10.1002/cncr.32347
4. Amin MB, Edge SB, Greene FL, Byrd DR, Brookland RK (2017) AJCC cancer staging manual. 8th ed. Springer, New York.
5. Benson AB, Venook AP, Al-Hawary MM, Arain MA, Chen YJ, Ciombor KK, Cohen S, Cooper HS, Deming D, Garrido-Laguna I, Grem JL, Hoffe S, Hubbard J, Hunt S, Kamel A, Kirilcuk N, Krishnamurthi S, Messersmith WA, Meyerhardt J, Miller ED, Mulcahy MF, Nurkin S, Overman MJ, Parikh A, Pate H, Pedersen K, Saltz L, Schneider C, Shibata D, Skibber JM, Sofocleous CT, Stoffel EM, Stotsky-Himelfarb E, Willett CG (2019) National Comprehensive Cancer Network (NCCN) Clinical Practice Guidelines in Oncology. Rectal cancer, Version3. 2019.https://www.nccn.org/patients/guidelines/cancers.aspx#rectal/. Accessed November 27,2019.