1. a University of California , San Diego, CA, USA
2. b University of Texas Southwestern Medical Center at Dallas , Dallas, TX, USA
3. c Baylor College of Medicine , Houston, TX, USA
4. d The Mount Sinai School of Medicine , New York, NY, USA
5. e University of Texas Medical Branch , Galveston, TX, USA
6. f VA Greater Los Angeles Healthcare System , University of California , Los Angeles, CA, USA
7. g University of California , Los Angeles, CA, USA
8. h VA San Diego Healthcare System , University of California , San Diego, CA, USA