1 Division of Rheumatology, University of California, Los Angeles, CA, United States.
2 Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States.
3 Department of Pathology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
4 Division of Cardiac Surgery, David Geffen School of Medicine, University of California, Los Angeles, CA, United States.