TY - JOUR T1 - Missing covariate data in clinical research: when and when not to use the missing-indicator method for analysis JF - Canadian Medical Association Journal JO - CMAJ SP - 1265 LP - 1269 DO - 10.1503/cmaj.110977 VL - 184 IS - 11 AU - Rolf H.H. Groenwold AU - Ian R. White AU - A. Rogier T. Donders AU - James R. Carpenter AU - Douglas G. Altman AU - Karel G.M. Moons Y1 - 2012/08/07 UR - http://www.cmaj.ca/content/184/11/1265.abstract N2 - ER -