[1] Univ Childrens Hosp Zurich, Dept Diagnost Imaging, Zurich, Switzerland
[2] Univ Childrens Hosp Zurich, Childrens Res Ctr, Zurich, Switzerland
[3] Univ Novi Sad, Fac Med, Radiol Dept, Novi Sad, Serbia
[4] Inst Children & Adolescents Hlth Care Vojvodina, Novi Sad, Serbia
[5] Royal Brompton Hosp, Radiol Dept, London, England
[6] Imperial Coll London, Natl Heart & Lung Inst, London, England
[7] Imperial Coll London, Ctr Paediat & Child Hlth, London, England
[8] Hosp Univ Virgen Rocio, Radiol Dept, Pediat Radiol Unit, Ave Manuel Siurot S-N, Seville, Spain