1. a Massachusetts Institute of Technology , Cambridge , MA , USA
2. b Aerodyne Research, Inc. , Billerica , MA , USA
3. c University of Waterloo , Canada
4. d Boston University , Boston , MA , USA
5. e Peking University , China
6. f Max Planck Institute for Chemistry , Germany
7. g Institute of Physics, University of São Paulo , Brazil
8. h Santiago , Chile
9. i Universidad de Santiago , Chile , USA
10. j Akiris S.A. , Bogotá , Colombia
11. k Desert Research Institute , Reno , NV , USA