@misc{indiciae770fd485c3c9,
  title = {Difficulties in conducting a prospective outcome study.},
  author = {Jetske Ultee and Johan W van Neck and Jean Bart Jaquet and Steven E R Hovius},
  year = {2003},
  doi = {10.1016/s0749-0712(03)00023-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/12945643/},
  note = {Source identifier: 12945643}
}