CORRIGENDA

In volume 88, Number 1, January 2010, the footer for pages 22-30 should be "Bull World Health Organ 2010;88:22-30" and the footer for pages 58-65 should be "Bull World Health Organ 2010;88:58-65".

Also in volume 88, Number 1, January 2010, page 49, the affiliation for David Carmena should read: Medical Research Council, Imperial College London, Du Cane Road, London, W12 0NN, England.