Multi-matrix assay of cortisol, cortisone and corticosterone using a combined MEPS-HPLC procedure

- Combined HPLC-DAD technique and microextraction by packed sorbent procedure.
- Determination of endogenous corticosteroids and generation of a multi-matrix profile.
- First report on the determination of corticosteroids in dried urine spots (DUSs).
- Application to healthy volunteers in comparison to two socially diversified groups.