[1] UMC Ljubljana, Univ Childrens Hosp Ljubljana, Ljubljana, Slovenia
[2] Univ Childrens Hosp Skopje, Skopje, Macedonia
[3] Clin Hosp Children Sfanta Maria, Iasi, Romania
[4] Univ Hosp Ctr Zagreb, Dept Pediat, Zagreb, Croatia
[5] Mother & Child Hlth Care Inst Serbia, Belgrade, Serbia
[6] Univ Hosp, Ctr Mother Teresa, Tirana, Albania
[7] Natl Genet Lab, Sofia, Bulgaria
[8] Univ Pediat Hosp Sofia, Sofia, Bulgaria
[9] Univ Clin Ctr Pristina, Pediat Clin, Pristina, Kosovo
[10] Univ Clin Ctr Sarajevo, Sarajevo, Bosnia & Herceg
[11] Clin Hosp Targu Mures, Targu Mures, Romania
[12] Clin Hosp Children Luis Turcanu, Timisoara, Romania
[13] Mother & Child Hlth Care Inst Alfred Rusescu, Bucharest, Romania
[14] Clin Hosp Children Iuliu Hateganu, Cluj Napoca, Romania
[15] Inst Sick Children, Clin Ctr Montenegro, Podgorica, Montenegro
[16] Univ Belgrade, Inst Mol Genet & Genet Engn, Belgrade, Serbia
[17] Children Hosp Banja Luka, Banja Luka, Bosnia & Herceg
[18] Acad Sci & Arts Bosnia & Herzegovina, Dept Med Sci, Sarajevo, Bosnia & Herceg
[19] Univ Clin Ctr Tuzla, Dept Pediat, Tuzla, Bosnia & Herceg
[20] Inst Mother & Child Hlth, Ctr Reprod Hlth & Med Genet, Kishinev, Moldova
[21] Univ Ljubljana, Fac Med, Dept Pediat, Ljubljana, Slovenia
[22] Univ Zagreb, Sch Med, Zagreb 41001, Croatia