@article{bermejo2001-11684897,
  author  = {Bermejo, F. and Gabriel, R. and Vega, S. and Morales, J. M. and Rocca, W. A. and Anderson, D. W.},
  title   = {{Problems and issues with door-to-door, two-phase surveys: an illustration from central Spain}},
  journal = {Neuroepidemiology},
  year    = {2001},
  doi     = {10.1159/000054794},
  pmid    = {11684897},
  url     = {https://doi.org/10.1159/000054794}
}