@article{Knol2011, author = {Knol, M.J. and Pestman, W.R. and Grobbee, D.E.}, title= {The (mis)use of overlap of confidence intervals to assess effect modification}, year = {2011}, doi = {10.1007/s10654-011-9563-8}, volume = {26}, number = {4}, pages = {253--254}, }