Correction to: The “Risser+” grade: a new grading system to classify skeletal maturity in idiopathic scoliosis (European Spine Journal, (2018), (1–8), 10.1007/s00586-018-5821-8)

BrAIST data provided to the authors by Drs. Dolan and Weinstein at the University of Iowa. BrAIST was funded by the National Institute of Arthritis and Musculoskeletal and Skin Diseases (R21AR049587 and R01AR052113, to Dr. Weinstein), the Children’s Miracle Network (to Dr. Weinstein), the Canadian Institutes of Health Research (FRN- 81050, to Dr. Wright), the Shriners Hospitals for Children (to Dr. Dobbs), the University of Rochester (to Dr. Sanders), and the Children’s Mercy Hospital and Clinics (to Dr. Price). The content is solely the responsibility of the authors and does not necessarily represent the views of the sponsors or the BrAIST investigators.