Diagnostic Value of Contrast-Enhanced Ultrasound in a 12-Year-Old Girl with Suspected Malposition of a Bladder Catheter and Ambiguous Findings on B-Mode Ultrasound – A Case Report - Armbruster, Marco; Rübenthaler, Johannes; Clevert, Dirk-André (Ultraschall in der Medizin - European Journal of Ultrasound, 2018)