@misc{indiciae25fed4b036e8,
  title = {The African challenge.},
  author = {Ymkje Stienstra and Winette T A van der Graaf and Margreet A Teelken and Debora E Ellen and Tjip S van der Werf},
  year = {2002},
  doi = {10.1016/s0140-6736(02)08457-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11988288/},
  note = {Source identifier: 11988288}
}