1 Lyon Neuroscience Research Centre, INSERM, CNRS, Université de Lyon, 69675 Bron, France; CERMEP, Hospices Civils de Lyon, 69500 Bron, France; National Institute for Nuclear Science and Technology, INSTN, CEA, 91400 Saclay, France. Electronic address: luc.zimmer@univ-lyon1.fr.
2 Université de Lille, Inserm, CHU de Lille, 59045 Lille, France.