File photo of a laboratory assistant holding one hemisphere of a healthy brain in the Neuropsychiatry division of the Belle Idee University Hospital in Chene-Bourg

 
File photo of a laboratory assistant holding one hemisphere of a healthy brain in the Neuropsychiatry division of the Belle Idee University Hospital in Chene-Bourg
A laboratory assistant holds one hemisphere of a healthy brain in the Morphological unit of psychopathology in the Neuropsychiatry division of the Belle Idee University Hospital in Chene-Bourg near Geneva in this March 14, 2011 file photo. REUTERS/Denis Balibouse/Files