[1] Univ Pisa, Sect Psychiat, Dept Clin & Expt Med, I-56100 Pisa, Italy
[2] Columbia Univ, Sch Social Work, Dept Social Work, New York, NY USA
[3] Univ Roma Tor Vergata, Dept Neurosci, I-00133 Rome, Italy
[4] Univ Southampton, Fac Med, Dept Psychiat, Acad Ctr,Coll Keep, Southampton SO14 3DT, Hants, England