1. Clinical Neurosciences, San Raffaele Scientific Institute, Via Stamira d'Ancona 20, Milan 20127 Italy
2. Center for Neurolinguistics and Theoretical Syntax, Institute for Advanced Study, Pavia, Italy
3. Faculty of Medicine and Surgery, Università Vita-Salute San Raffaele, Milan, Italy
4. IRCCS Centro Neurolesi “Bonino Pulejo”, Messina, Italy