1. University of Washington and Seattle Children's Research Institute, Seattle, WA, USA.
2. McGill University, Montreal, Canada.
3. University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
4. Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
5. Weil Cornell Medical College, New York, NY, USA.
6. Instituto Butantan, São Paulo, Brazil.
7. Johns Hopkins University, Baltimore, MD, USA.
8. University of Puerto Rico School of Medicine, San Juan, Puerto Rico, USA.