Detection of unsuspected cathinone and piperazine-type drugs in urine samples positive for methamphetamine and amphetamine collected in emergency departments

1. Muñiz, I.G.
2. Lendoiro, E.
3. De-Castro-ríos, A.
4. Guerrero, M.Á.E.
5. Ferrando, J.P.
6. Frias, L.S.
7. Cortés, P.S.
8. Martín, B.B.