@article{propensityscoreestimationusing,
  title = {Propensity score estimation using classification and regression trees in the presence of missing covariate data},
  author = {Bas B. L. Penning de Vries and Maarten van Smeden and Rolf H. H. Groenwold},
  year = {2018},
  eprint = {1807.09462},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1807.09462v1},
}