1. Hospital for Special Surgery, Arthritis & Tissue Degeneration, New York, NY 10021, USA
2. Department of Medicine, Weill Cornell Medical College, New York, NY 10065, USA
3. Regeneron Pharmaceuticals, Inc., Tarrytown, NY 10591, USA
4. Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece