Due to an oversight by the authors, “The Pediatric Proton Consortium Registry: A Multi-institutional Collaboration in U.S. Proton Centers,” by Hallie B. Kasper, Lisa Raeke, Daniel J. Indelicato, Heather Symecko, William Hartsell, Anita Mahajan, Christine Hill-Kayser, Stephanie M. Perkins, Andrew L. Chang, Stephanie Childs, Jeffrey C. Buchsbaum, Fran Laurie, Atif J. Khan, Christine Giraud, Beow Y. Yeap and Torunn I. Yock which appeared in Volume 1, Issue 2 of IJPT, pages 323–333, Figure 1 was not complete. Here is the correct figure: