Metal contents in the most widely consumed commercial preparations of four different medicinal plants (Aloe, Senna, ginseng, and ginkgo) from Europe

1. Rubio, C.
2. Paz, S.
3. Tius, E.
4. Hardisson, A.
5. Gutierrez, A.J.
6. Gonzalez-Weller, D.
7. Caballero, J.M.
8. Revert, C.