@article{surrogateoutcomesandtransportability,
  title = {Surrogate Outcomes and Transportability},
  author = {Santtu Tikka and Juha Karvanen},
  year = {2018},
  eprint = {1806.07172},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1806.07172v4},
}