@misc{indiciae2aa11037b283,
  title = {Field epidemiology: methodological constraints and limitations in the developing world.},
  author = {E E Ekanem},
  year = {1985},
  doi = {10.1016/s0033-3506(85)80125-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/3991874/},
  note = {Source identifier: 3991874}
}