Authors' response. Issue 12 (12th October 2011) - Lim, Wei Shen; Bewick, Thomas; Myles, Puja; Greenwood, Sonia; Nguyen-Van-Tam, Jonathan S; Brett, Stephen; Semple, Malcolm G; Openshaw, Peter J; Bannister, Barbara; Read, Robert C; Taylor, Bruce; McMenamin, Jim; et al.