What predictive parameters best indicate the need for emergent gastrointestinal endoscopy after foreign body ingestion?

1. Ciriza, C.
2. García, L.
3. Suárez, P.
4. Jiménez, C.
5. Romero, M.J.
6. Urquiza, O.
7. Dajil, S.
8. De Los Ríos, C.C.