Reply to S. Shi et al and G.W. Peters et al

Geertjan van Tienhoven¹, Eva Versteijne¹, Aeilko H Zwinderman¹+2

• ¹Geertjan van Tienhoven, MD, PhD; and Eva Versteijne, MD, Department of Radiation Oncology, Cancer Center Amsterdam, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands; Aeilko H. Zwinderman, PhD, Department of Clinical Epidemiology and Biostatics, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands; Cornelis J. Punt, MD, PhD, Department of Medical Oncology, Cancer Center Amsterdam, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands; and Casper H. van Eijck, MD, PhD, Department of Surgery, Erasmus MC Cancer Institute, Rotterdam, the Netherlands.