Response to: "Utility of endogenous 4β-hydroxycholesterol as a biomarker to assess cytochrome P 450 3A (CYP3A) activity: not quite ready for prime time"
1 Section for Pharmacology, Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Blindern, P.O. Box 1068, 0316, Oslo, Norway. k.e.kvitne@farmasi.uio.no.
2 Center for Psychopharmacology, Diakonhjemmet Hospital, Oslo, Norway.
3 Department of Life Sciences and Health, Oslo Metropolitan University, Oslo, Norway.
4 Section for Pharmacology, Pharmaceutical Biosciences, Department of Pharmacy, University of Oslo, Blindern, P.O. Box 1068, 0316, Oslo, Norway.