@article {762551, title = {Dissecting direct and indirect genetic effects on chronic obstructive pulmonary disease (COPD) susceptibility}, journal = {Human Genetics}, volume = {132}, number = {4}, year = {2013}, pages = {431-441}, author = {M. Siedlinski and D. Tingley and P. Lipman and M. Cho and A. Litonjua and D. Sparrow and P. Bakke} }