1. Department of Diagnostic Imaging; University Children's Hospital Zürich; Zürich Switzerland
2. Children's Research Centre; University Children's Hospital Zürich; Zürich Switzerland
3. Center of Dental Medicine; University of Zürich; Zürich Switzerland
4. Division of Rheumatology; University Children's Hospital; Zürich Switzerland
5. Department of Paediatrics; Cantonal Hospital Winterthur; Winterthur Switzerland