1. University of Ottawa, Ottawa; Ontario Canada
2. Centre Hospitalier Universitaire La Cavale Blanche; Brest France
3. Ospedale Pediatrico Bambino Gesù; Rome Italy
4. Hospital Ramon y Cajal; Madrid Spain
5. Pediatric Rheumatology Research Institute; Bad Bramstedt Germany
6. Sapienza Università di Roma; Rome Italy
7. Hospital General Universitario Gregorio Marañón; Madrid Spain
8. Ambroise Paré Hospital and Versailles Saint Quentin en Yvelines University; Paris France
9. Hospital Universitario Severo Ochoa; Madrid Spain