Effectiveness of hepatitis A vaccination as post-exposure prophylaxis oleh Ignasi Parrón, Caritat Planas, Pere Godoy, Sandra Manzanares-Laya, Ana Martínez, Maria Rosa Sala, Sofia Minguell, Nuria Torner, Mireia Jané, Angela Domínguez, the Working Group for the Study of Hepatitis A in Catalonia