1. Division of Pediatric Allergy, Immunology, and Rheumatology, University Hospitals Rainbow Babies and Children's Hospital, Cleveland, OH
2. Pediatric Rheumatology Section, Department of Pediatrics, Hospital Italiano, Buenos Aires, Argentina
3. Pediatric Rheumatology Section, Department of Pediatrics, Federal University of Sao Paulo, Sao Paulo, Brazil
4. Rheumatology Section, Hospital de Niños Dr Ricardo Gutierrez, Buenos Aires, Argentina.