@article{helle_2017, 
  title={Selection bias in studies of human reproduction-longevity trade-offs}, 
  volume={284}, 
  DOI={10.1098/rspb.2017.2104}, 
  number={1868}, 
  publisher={The Royal Society}, 
  author={Helle}, 
  year={2017}, 
  month={Nov}
  }