Detection of previously undiagnosed or lost to follow-up hepatitis C infections by implementing an opportunistic screening in an emergency department Ferran Llopis-Roca; Ana Suárez-Lledó; Alexis Rebollo-Curbelo; Laura Calatayud-Samper; María Jesús Urdániz-Fraguas; Francisca Márquez-Rodríguez; José Castellote-Alonso; Alba Carrodeguas; José Luis González-Sánchez; Pierre Malchair;