Utama Abdi Tarigan , Hidayat, B. Y. F. E. S. , F. B. B. ,. “The Polymorphism of Gene Reduced Folate Carrier 1 (RFC1) A80G Not Difference Between NSCLP Case and Control in Sumatera Utara, Indonesia”. International Journal of Medical Science and Clinical Invention, vol. 4, no. 10, Oct. 2017, doi:10.18535/ijmsci/v4i10.08.