@misc{indiciae3f6185a8f14c,
  title = {Crossover designs versus parallel studies in infertility research.},
  author = {E R te Velde and B J Cohlen and C W Looman and J D Habbema},
  year = {1998},
  doi = {10.1016/s0015-0282(97)00491-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/9496358/},
  note = {Source identifier: 9496358}
}