A Common SMAD7 Variant Is Associated with Risk of Colorectal Cancer: Evidence from a Case-Control Study and a Meta-Analysis Song, Qibin ; Zhu, Beibei ; Hu, Weiguo ; Cheng, Liming ; Gong, Hongyun ; Xu, Bin ; Zheng, Xiawen ; Zou, Li ; Zhong, Rong ; Duan, Shengyu ; Chen, Wei ; Rui, Rui ; Wu, Jing ; Miao, Xiaoping Abstract Publication: PLoS ONE Pub Date: March 2012 DOI: 10.1371/journal.pone.0033318 Bibcode: 2012PLoSO...733318S