Single nucleotide polymorphisms of one-carbon metabolism and cancers of the esophagus, stomach, and liver in a Chinese population. oleh Shen-Chih Chang, Po-Yin Chang, Brendan Butler, Binh Y Goldstein, Lina Mu, Lin Cai, Nai-Chieh Y You, Aileen Baecker, Shun-Zhang Yu, David Heber, Qing-Yi Lu, Liming Li, Sander Greenland, Zuo-Feng Zhang