Additional file 1: of Association between SMAD3 gene polymorphisms and osteoarthritis risk: a systematic review and meta-analysis HongJian-qiao WangYang-xin LiSi-hao JiangGuang-yao HuBin YangYu-te MengJia-hong YanShi-gui 2018 Table S1. PRISMA checklist. (DOC 63 kb)