13C-urea breath test for the diagnosis of Helicobacter pylori infection before treatment: Is citric acid necessary?

1. Gisbert, J.P.
2. Vazquez, M.A.
3. Jimenez, I.
4. Cruzado, A.I.
5. Carpio, D.
6. Del Castillo, E.
7. Martin, M.J.
8. Morales, A.
9. Pajares, R.
10. Rodriguez, A.
11. Pajares, J.M.