@misc{indiciae4ecc73bdc8e9,
  title = {Shadow method for sun protection.},
  author = {L Holloway},
  year = {1990},
  doi = {10.1016/0140-6736(90)90725-k},
  url = {https://pubmed.ncbi.nlm.nih.gov/1968212/},
  note = {Source identifier: 1968212}
}