Seroprevalence status of vaccine-preventable diseases in migrants living in shelter centers in Barcelona, Spain Carles Rubio Maturana; Marta Guerrero; Maria Casas Claramunt; Susana Nuria Ayala-Cortés; Victoria López; Patricia Martínez-Vallejo; Begoña Treviño; Elena Sulleiro; Juliana Esperalba; Ariadna Rando; Diana Pou; Maria Luisa Aznar; Pau Bosch-Nicolau; Fernando Salvador; Inés Oliveira-Souto; Israel Molina; Núria Serre-Delcor;