@article {carrillo2010pseudo, title = {The pseudo-GEE approach to the analysis of longitudinal surveys}, journal = {Canadian Journal of Statistics}, volume = {38}, number = {4}, year = {2010}, pages = {540{\textendash}554}, publisher = {Wiley Online Library}, author = {Carrillo, Iv{\'a}n A and Chen, Jiahua and Wu, Changbao} }