Brumback B, Greenland S, Redman M, Kiviat N, Diehr P. The intensity-score approach to adjusting for confounding. Biometrics. 2003 Jun;59(2):274-85.
Brumback B, Greenland S, Redman M, Kiviat N, Diehr P. The intensity-score approach to adjusting for confounding. Biometrics. 2003 Jun;59(2):274-85.