B. Y. F. E. S. , F. B. B. , Utama Abdi Tarigan , Hidayat, “The Polymorphism of Gene Reduced Folate Carrier 1 (RFC1) A80G Not Difference Between NSCLP Case and Control in Sumatera Utara, Indonesia”, ijmsci, vol. 4, no. 10, Oct. 2017.