Cross-reactivity between a penicillin and a cephalosporin with the same side chain

1. Miranda, A.
2. Blanca, M.
3. Vega, J.M.
4. Moreno, F.
5. Carmona, M.J.
6. Garcia, J.J.
7. Segurado, E.
8. Justicia, J.L.
9. Juarez, C.