Section of Pediatric Radiology;
Department of Diagnostic and Interventional Radiology;
University Hospital Wuerzburg;
Department of Diagnostic and Interventional Radiology;
University Hospital Wuerzburg;
Department of Pediatrics;
Hegau-Bodensee-Hospital Singen;
Department of Diagnostic and Interventional Radiology;
University Hospital Ulm;
Voiding urosonography; Ultrasound contrast agent; Vesicoureteral reflux; SonoV ue; Adverse events; Sulfur hexafluoride;