[1] Univ Lyon, ENS, CNRS, Chim Lab, F-69364 Lyon, France
[2] Univ Grenoble 1, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France
[3] Univ Grenoble 1, INSERM, U823, F-38042 Grenoble, France
[4] Univ Grenoble 1, Inst Oncol Dev Albert Bonniot, CHU Grenoble, EFS, F-38042 Grenoble, France