Double-guidewire technique for difficult bile duct cannulation: a multicenter randomized, controlled trial

1. Herreros de Tejada, A.
2. Calleja, J.L.
3. Díaz, G.
4. Pertejo, V.
5. Espinel, J.
6. Cacho, G.
7. Jiménez, J.
8. Millán, I.
9. García, F.
10. Abreu, L.