[1] Univ Oulu, Dept Child Psychiat, Inst Clin Med, Fac Med, SF-90100 Oulu, Finland
[2] Univ Hosp Oulu, Oulu, Finland
[3] Abbassia Mental Hosp, Child Psychiat Unit, Cairo, Egypt
[4] Univ Oulu, Thule Inst, SF-90100 Oulu, Finland
[5] Univ Oulu, Child Language Res Ctr, Fac Humanities, Logoped, SF-90100 Oulu, Finland
[6] Ain Shams Univ, Inst Postgrad Childhood Studies, Cairo, Egypt
[7] Helwan Univ, Fac Arts, Dept Psychol, Cairo, Egypt
[8] Massachusetts Gen Hosp, Dept Psychiat, Boston, MA 02114 USA