Affiliation: | 1. Paediatric Orthopaedic Department, University Children''s Hospital Basle, Basel, Switzerland;2. Orthopaedic Department, Baselland Hospital, Bruderholz, Switzerland;3. Department of Orthopedic Surgery, Boston Children''s Hospital, Harvard Medical School, Boston, Massachusetts, U.S.A.;4. Royal Hospital for Sick Children, Edinburgh, Scotland |