1. Univ Brest, UMR-CNRS 6521 CEMCA, 6 Avenue Victor le Gorgeu, 29200 BREST, France
2. Fluidigm Canada Inc., 1380 Rodick Street, Markham, Ontario L3R 4G5, Canada
3. Department of Chemistry, University of Toronto, 80 Saint George Street, Toronto, Ontario M5S 3H6, Canada