@article{hes94ass,
  title = {Assessing Time-by-Covariate Interactions in Proportional Hazards Regression Models Using Cubic Spline Functions},
  volume = {13},
  journal = {Stat Med},
  author = {Hess, Kenneth R.},
  year = {1994},
  keywords = {graphical-methods,ph,tdc,spline},
  pages = {1045-1062},
  citeulike-article-id = {13264291},
  posted-at = {2014-07-14 14:09:32},
  priority = {0}
}

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