1. Department of Medicine, University of Friburg, Fribourg, Switzerland. E-mail: amandine.dubois@unifr.ch
2. Inria, Villers-lès-Nancy, 54600, France. E-mail: francois.charpillet@inria.fr
3. Université de Lorraine, LORIA, UMR 7503, Vandœuvre-lès-Nancy, 54506, France