Urinary testosterone (T) to epitestosterone (E) ratios by GC/MS. I. Initial comparison of uncorrected T/E in six international laboratories

1. Catlin, D.H.
2. Cowan, D.A.
3. De La Torre, R.
4. Donike, M.
5. Fraisse, D.
6. Oftebro, H.
7. Hatton, C.K.
8. Starcevic, B.
9. Becchi, M.
10. De La Torre, X.
11. Norli, H.
12. Geyer, H.
13. Walker, C.J.