TY  - RPRT
TI  - Analysis of 25-hydroxyvitamin D in plasma using solid phase extraction.
AU  - G S Shephard
AU  - S M Carlini
AU  - C Hanekom
AU  - D Labadarios
PY  - 1987
DO  - 10.1016/0009-8981(87)90376-7
UR  - https://pubmed.ncbi.nlm.nih.gov/3665098/
ID  - 3665098
ER  -