We would like to acknowledge the help and advice of the following in the Editorial in the issue of 13 October 2007, Managing patients on warfarin: Dr David J Perry, Consultant Haematologist, Addenbrookes Hospital; Dr Tim J C Noakes, Consultant Haematologist, Derriford Hospital NHS Trust; Dr Paul S Helliwell, National Patient Safety Agency, London.

We apologise that this was omitted at the time of publication.