[1] Natl & Kapodistrian Univ Athens, Aghia Sophia Childrens Hosp, Ctr Adolescent Med, Med Sch,Dept Pediat 1, 1 Thivon Str, Athens 11527, Greece
[2] Natl & Kapodistrian Univ Athens, Aghia Sophia Childrens Hosp, UNESCO Chair Adolescent Hlth Care, Med Sch,Dept Pediat 1, 1 Thivon Str, Athens 11527, Greece
[3] Natl & Kapodistrian Univ Athens, Aretaieio Hosp, Med Sch, Dept Radiol 1, 76 Vassilisis Sofias Ave, Athens 11528, Greece
[4] Natl & Kapodistrian Univ Athens, Hippokratio Hosp, Med Sch, Res Lab,Dept Internal Med 2, Athens 11527, Greece
[5] Natl & Kapodistrian Univ Athens, Aretaieio Hosp, Med Sch, Dept Obstet & Gynecol 2, 76 Vassilisis Sofias Ave, Athens 11528, Greece
[6] Mitera Childrens Hosp, Dept Pediat & Adolescent Gynecol, Erythrou Stavrou, Athens 15123, Greece