1. Department of Rheumatology and Medicine, Hospital for Joint Diseases, New York University School of Medicine, New York, New York, USA
2. Division of Pediatric Cardiology, Department of Pediatrics, St Luke's-Roosevelt Hospital Center, New York, New York, USA
3. Department of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, Connecticut, USA
4. Department of Pediatrics, Columbia University College of Physicians and Surgeons, New York, New York, USA
5. Department of Pediatric Cardiology, Stanford University School of Medicine, Stanford, California, USA
6. Department of Rheumatology and Medicine, Hospital for Joint Diseases, New York University School of Medicine, New York, New York, USA; Department of Rheumatology, Room 1608, Hospital for Joint Diseases, 301 East 17th Street, New York, NY 10003, USA