[1] Pediatric Rheumatology Unit,Department of Rheumatology
[2] Hospital S. João,Department of Rheumatology
[3] Hospital Infante D. Pedro,Department of Pediatrics, Faculty of Medicine of Porto
[4] Hospital S. João,Department of Rheumatology, Pediatric Rheumatology Unit
[5] Faculty of Medicine of Porto,undefined
[6] Hospital S. João,undefined