Christian Wittekind, MD; Professor of Pathology, Chairman Institute of Pathology, University of Leipzig, Germany.James D Brierley, BSc, MB, FRCP, FRCR, FRCPC; Professor, Department of Radiation Oncology, Princess Margaret Cancer Centre / University of Toronto, Toronto, Ontario, Canada.Anne W. M. Lee, MD; Clinical Professor, Department of Clinical Oncology, The University of Hong Kong, Hong Kong, China.Elisabeth van Eycken, MD; Director, Belgium Cancer Registry, Brussels, Belgium.