TY - JOUR A1 - Yau, K.K.W. A1 - McGilchrist, C.A. T1 - ML and REML estimation in survival analysis with time dependent correlated frailty Y1 - 1998 DO - 10.1002/(sici)1097-0258(19980615)17:11<1201::aid-sim845>3.0.co;2-7 JF - Statistics in Medicine VL - 17 IS - 11 SP - 1201 EP - -1213 ER -