[1] Univ Basel, Childrens Hosp, Gen Pediat, CH-4003 Basel, Switzerland
[2] Univ Basel, Childrens Hosp, Pediat Radiol, CH-4003 Basel, Switzerland
[3] Univ Basel Hosp, Dept Otorhinolaryngol, Basel, Switzerland
[4] Univ Basel, Childrens Hosp, Gen Pediat, Pediat Infect Dis & Pharmacol, Basel, Switzerland
[5] Univ Melbourne, Dept Pediat, Parkville, Vic 3052, Australia