Treatment of hepatic pancreatic ductal adenocarcinoma metastases with high-dose-rate image-guided interstitial brachytherapy: a single center experience - Drewes, Ralph; Omari, Jazan; Manig, Matthias; Seidensticker, Max; Hass, Peter; Ricke, Jens; Powerski, Maciej; Pech, Maciej (Journal of Contemporary Brachytherapy, 2019)