title: Response:.
authors.affiliation: Department of Gastroenterology and Hepatology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
authors.forename: Selma J
authors.initials: SJ
authors.lastname: Lekkerkerker
authors.affiliation: Department of Radiotherapy, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
authors.forename: Astrid
authors.initials: A
authors.lastname: van der Horst
authors.affiliation: Department of Radiotherapy, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
authors.forename: Eelco
authors.initials: E
authors.lastname: Lens
authors.affiliation: Department of Radiotherapy, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
authors.forename: Raquel Dávila
authors.initials: RD
authors.lastname: Fajardo
authors.affiliation: Department of Gastroenterology and Hepatology, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands.
authors.forename: Jeanin E
authors.initials: JE
authors.lastname: van Hooft
mesh_terms: D005260:Female; D057918:Fiducial Markers; D006801:Humans; D008297:Male; D009339:Needles; D010190:Pancreatic Neoplasms / Q000532:radiotherapy*; D061089:Radiotherapy, Image-Guided; D018084:Ultrasonography, Interventional / Q000295:instrumentation*