@misc{indiciae9ea182947cf8,
  title = {Melatonin in serum.},
  author = {L Wetterberg},
  year = {1977},
  doi = {10.1038/269646a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/593327/},
  note = {Source identifier: 593327}
}