[1] Univ Lisbon, Fac Ciencias, BioISI Biosyst & Integrat Sci Intitute, P-1749016 Lisbon, Portugal
[2] Univ Nova Lisboa, Fac Ciencias & Tecnol, Lab Instrumentacao Engn Biomed & Fis Radiacao LIB, Dept Fis, P-2892516 Monte De Caparica, Caparica, Portugal
[3] Univ Paris 06, Sorbonne Univ, Ecole Normale Super, CNRS,Lab Kastler Brossel, F-75252 Paris 05, France