1 Department of Psychiatry, Università Cattolica, Roma.
2 Department of Experimental and Clinical Medicine, Section of Psychiatry, University of Pisa, Pisa, Italy.
3 Department of Psychiatry, Queen's University, Kingston, Canada; International Consortium for Mood & Psychotic Disorder Research, McLean Hospital, Belmont, MA, USA.
4 International Consortium for Mood & Psychotic Disorder Research, McLean Hospital, Belmont, MA, USA; Department of Psychiatry, Harvard Medical School, Boston, MA, USA; Lucio Bini Mood Disorder Centers, Cagliari & Rome, Italy. Electronic address: ltondo@aol.com.