2 Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania.
3 David Geffen School of Medicine at University of California, Los Angeles, California.
4 Washington University School of Medicine, St Louis, Missouri, and MemorialCare Saddleback Medical Center, Laguna Hills, California.
5 California State University, Northridge, California; MemorialCare Saddleback Medical Center, Laguna Hills, California; and Cedars-Sinai Medical Center, Los Angeles, California.
6 Metrodora Institute, West Valley City, Utah.
7 Sjögren's Foundation, Reston, Virginia.
8 Sjögren's Foundation, Reston, Virginia, and Temple University Kornberg School of Dentistry, Philadelphia, Pennsylvania.
9 Scripps Memorial Hospital and Research Foundation, La Jolla, California.
10 Stanford University, Palo Alto, California.
11 University of Virginia, Charlottesville, Virginia, and Inova Health Systems, Ashburn, Virginia.
12 Donald and Barbara Zucker School of Medicine at Hofstra/Northwell and New York Medical College, New York.
13 Athens Medical Center, Athens, Greece.
14 Oklahoma Medical Research Foundation, University of Oklahoma Health Sciences Center, and Oklahoma City Department of Veterans Affairs Medical Center, Oklahoma City, Oklahoma.
15 Cedars-Sinai Medical Center and David Geffen School of Medicine at University of California, Los Angeles.
16 University of California, San Francisco, and Herbert Wertheim School of Optometry and Vision Science at the University of California, Berkeley.
17 New York University Grossman Long Island School of Medicine, Mineola, New York.