1. Cancer Research UK & UCL Cancer Trials Centre (A.H.), University College London, London NW1 2ND, United Kingdom
2. Formerly Thyroid Cancer Unit (C.H.), Royal Marsden Hospital, London SW3 6JJ, United Kingdom
3. Newcastle General Hospital (U.M.), Newcastle NE4 6BE, United Kingdom
4. Chelsea and Westminster Hospital (M.H.), London SW10 9NH, United Kingdom
5. Division of Medical Sciences (J.A.F.), University of Birmingham, Queen Elizabeth Hospital, Birmingham B15 2TH, United Kingdom