1 "Reine Fabiola" Children's University Hospital, Université Libre de Bruxelles (ULB), 15, Avenue Jean Joseph Crocq, 1020, Brussels, Belgium. paoloemiliosimoni@gmail.com.
2 Rheumatology Department, CHU de Liège, CHU du Sart Tilman, Bât. 35, 4000, Liège, Belgium. paoloemiliosimoni@gmail.com.
3 Rheumatology Department, CHU de Liège, CHU du Sart Tilman, Bât. 35, 4000, Liège, Belgium.
4 Radiology Department, CHU de Liège, CHU du Sart Tilman, Bât. 35, 4000, Liège, Belgium.
5 "Reine Fabiola" Children's University Hospital, Université Libre de Bruxelles (ULB), 15, Avenue Jean Joseph Crocq, 1020, Brussels, Belgium.
The published version of this article contained a mistake. In Table 1 of the original article, the numbers of successful injections and failed injections were not correct. The correct Table 1 should read as given below.