@article {karim2018comparison, title = {Comparison of statistical approaches dealing with time-dependent confounding in drug effectiveness studies}, journal = {Statistical methods in medical research}, volume = {27}, number = {6}, year = {2018}, pages = {1709{\textendash}1722}, publisher = {SAGE Publications Sage UK: London, England}, author = {Karim, Mohammad Ehsanul and Petkau, John and Gustafson, Paul and Platt, Robert W and Tremlett, Helen and BeAMS Study Group} }