@article{Putter2007,
author = {Putter, H. and Fiocco, M. and Geskus, R.B.},
title= {Tutorial in biostatistics: competing risks and multi-state models},
year = {2007},
doi = {10.1002/sim.2712},
journal = {Statistics in Medicine},
volume = {26},
number = {11},
pages = {2389--2430},
}