@article{heterogeneouscausaleffectofpolysubstance,
  title = {Estimating Heterogeneous Causal Effect of Polysubstance Usage on Drug Overdose from Large-Scale Electronic Health Record},
  author = {Vaishali Mahipal and Mohammad Arif Ul Alam},
  year = {2021},
  eprint = {2105.07224},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2105.07224v2},
}