Four years' experience in external proficiency testing programs for hair testing of drugs of abuse in Italy (HAIRVEQ) and comparison with the Society of Hair Testing Program in 2005

1. Ventura, M.
2. Pichini, S.
3. Pujadas, M.
4. Ventura, R.
5. Giovannandrea, R.D.
6. Zuccaro, P.
7. Pacifici, R.
8. Langohr, K.
9. Jurado, C.
10. Torre, R.D.L.