[1] Univ Cattolica, Dept Psychiat, Rome, Italy
[2] Univ Pisa, Dept Expt & Clin Med, Sect Psychiat, Pisa, Italy
[3] Queens Univ, Dept Psychiat, Kingston, ON, Canada
[4] McLean Hosp, Int Consortium Mood & Psychot Disorder Res, 115 Mill St, Belmont, MA 02178 USA
[5] Harvard Med Sch, Dept Psychiat, Boston, MA 02115 USA
[6] Lucio Bini Mood Disorder Ctr, Cagliari, Italy
[7] Lucio Bini Mood Disorder Ctr, Rome, Italy