Domínguez Cajal MM, de Arriba Muñoz A, Escosa García L, García Íñiguez JP, Biosca Pàmies M, García Sánchez N. Influenza vaccine coverage of children at high-risk during 2007-2008 in a Primary Care Centre in Spain. Rev Pediatr Aten Primaria. 2009;11:399-411.