[1] Natl & Kapodistrian Univ Athens, Med Sch, Lab Med Genet, Athens, Greece
[2] Aghia Sophia Childrens Hosp, Athens, Greece
[3] Natl & Kapodistrian Univ Athens, Aghia Sophia Childrens Hosp, Med Sch, Dept Paediat 1, Athens, Greece
[4] Natl & Kapodistrian Univ Athens Athens, Sch Med, Postgrad Program Biostat, Athens, Greece
[5] Natl & Kapodistrian Univ Athens, Aghia Sophia Childrens Hosp, Lab Med Sch, Athens, Greece
[6] Aghia Sophia Childrens Hosp, Dept Neurol, Athens, Greece
[7] Penteli Childrens Hosp, Dept Pediat Neurol, Athens, Greece
[8] Aristotle Univ Thessaloniki, Univ Gen Hosp AHEPA, Sch Med, Dept Pediat 2, Thessaloniki, Greece
[9] Aristotle Univ Thessaloniki, Gen Hosp Papageorgiou, Sch Med, Dept Pediat, Thessaloniki, Greece
[10] PA Kyriakou Childrens Hosp, JDept Neurol, Athens, Greece
[11] Natl & Kapodistrian Univ Athens, Attikon Univ Hosp, Dept Pediat 3, Athens, Greece
[12] Univ Hosp Heraklion, Pediat Dept, Iraklion, Greece
[13] Venizeleion Gen Hosp, Pediat Neurol Clin, Iraklion, Crete, Greece
[14] Karamandanion Childrens Hosp, Dept Pediat Neurol, Patras, Greece
[15] Univ Ioannina, Dept Pediat, Stavros Niarchos Ave, Ioannina, Greece
[16] Univ Thessaly, Univ Hosp Larissa, Pediat Dept, Larisa, Greece
[17] Natl & Kapodistrian Univ Athens, Med Sch, P&A Kyriakou Childrens Hosp, Dept Pediat 2, Athens, Greece
[18] Natl & Kapodistrian Univ Athens, Eginit Hosp, Med Sch, Dept Neurol, Athens, Greece
[19] Natl & Kapodistrian Univ Athens, Attikon Univ Hosp, Dept Neurol 2, Athens, Greece