title: Erratum to: 18F-FDG PET/MRI evaluation of retroperitoneal fibrosis: a simultaneous multiparametric approach for diagnosing active disease.
authors.affiliation: Department of Nuclear Medicine, Medical Faculty, University Duisburg-Essen, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany. verena.ruhlmann@uk-essen.de.
authors.forename: Verena
authors.initials: V
authors.lastname: Ruhlmann
authors.affiliation: Department of Nuclear Medicine, Medical Faculty, University Duisburg-Essen, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany.
authors.forename: Thorsten Dirk
authors.initials: TD
authors.lastname: Poeppel
authors.affiliation: Department of Urology and Paediatric Urology, HELIOS Medical CenterWuppertal, University HospitalWitten/Herdecke, Heusnerstr. 40, 42283, Wuppertal, Germany.
authors.forename: Alexander Sascha
authors.initials: AS
authors.lastname: Brandt
authors.affiliation: Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, Hufelandstraße 55, 45122, Essen, Germany.
authors.forename: Johannes
authors.initials: J
authors.lastname: Grueneisen
authors.affiliation: Department of Nuclear Medicine, Medical Faculty, University Duisburg-Essen, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany.
authors.forename: Marcus
authors.initials: M
authors.lastname: Ruhlmann
authors.affiliation: Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, Hufelandstraße 55, 45122, Essen, Germany.
authors.forename: Jens Matthias
authors.initials: JM
authors.lastname: Theysohn
authors.affiliation: Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, Hufelandstraße 55, 45122, Essen, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Forsting
authors.affiliation: Department of Nuclear Medicine, Medical Faculty, University Duisburg-Essen, University Hospital Essen, Hufelandstraße 55, 45147, Essen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Bockisch
authors.affiliation: Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, Hufelandstraße 55, 45122, Essen, Germany.
authors.forename: Lale
authors.initials: L
authors.lastname: Umutlu