@misc{indiciae383e61d82a2b,
  title = {Analysis of 25-hydroxyvitamin D in plasma using solid phase extraction.},
  author = {G S Shephard and S M Carlini and C Hanekom and D Labadarios},
  year = {1987},
  doi = {10.1016/0009-8981(87)90376-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/3665098/},
  note = {Source identifier: 3665098}
}