TY - JOUR A1 - Karaca-Mandi, P. A1 - Norton, E.C. A1 - Dowd, B. T1 - Interaction terms in nonlinear models Y1 - 2012 DO - 10.1111/j.1475-6773.2011.01314.x JF - Health Services Research VL - 47 IS - 1 ER -