Roles of iron acquisition systems in virulence of extraintestinal pathogenic Escherichia coli: salmochelin and aerobactin contribute more to virulence than heme in a chicken infection model - Gao, Q; Wang, X; Xu, H; Xu, Y; Ling, J; Zhang, D; Gao, S; Liu, X (BMC Microbiol, 2012)