1. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
2. University of Texas at Austin Austin TX USA
3. NASA Goddard Space Flight Center, Biospheric Sciences Lab Greenbelt MD USA
4. Brookhaven National Laboratories Upton NY USA
5. University of Wisconsin Madison Madison WI USA
6. University of Maryland, Baltimore County Baltimore MD USA
7. NASA Goddard Space Flight Center Greenbelt MD USA