%0 Journal Article %T Association of Matrix Metalloproteinase 9 (MMP-9) Polymorphisms with Asthma Risk: A Meta-Analysis %A Fenfang Zou %A Guoan Xiang %A Hongbin Jiao %A Hongmei Gao %A Jianpeng Zhang %J Archive of "Canadian Respiratory Journal". %D 2019 %R 10.1155/2019/9260495 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6410464/