Position on the management of occult infection by hepatitis B virus (OBI) and anti-HBc + in hemodialysis units Guillermina Barril Cuadrado; Ana Avellón Calvo; Elena Jiménez Vibora; Luisa García Buey; Rosa María Ruiz-Calero Cendrero; Antonio Cirugeda García; José Ibeas López; Cristina García Fernandez; Federico García García; Roberto Alcázar Arroyo;