Dual mixed-mode poly (vinylpyridine-co-methacrylic acid-co-ethylene glycol dimethacrylate)-based sorbent for acidic and basic drug extraction from oral fluid samples

1. Sorribes-Soriano, A.
2. Esteve-Turrillas, F.A.
3. Armenta, S.
4. Herrero-Martínez, J.M.