Iron status and Helicobacter pylori infection in symptomatic children: an international multi-centered study. oleh Dulciene Maria Magalhaes Queiroz, Paul R Harris, Ian R Sanderson, Henry J Windle, Marjorie M Walker, Andreia Maria Camargos Rocha, Gifone Aguiar Rocha, Simone Diniz Carvalho, Paulo Fernando Souto Bittencourt, Lucia Porto Fonseca de Castro, Andrea Villagrán, Carolina Serrano, Dermot Kelleher, Jean E Crabtree