1 Child Neuropsychiatry Unit, Deptartment of Neuroscience, IRCCS Children Hospital Bambino Gesù, Rome 00165, Italy; NESMOS Department, Sant'Andrea Hospital, Sapienza University of Rome, Rome, Italy; Department of Psychiatry, Harvard Medical School, Boston, MA, USA; International Consortium for Bipolar and Psychotic Disorders Research, Mailman Research Center, McLean Hospital, Belmont, MA, USA. Electronic address: giuliaserra@gmail.com.