Performance evaluation of IVC systems Summary Report of the Working Group on Evaluation of IVC Systems of the Animal Welfare Information Center for Biomedical Research of the Faculty of Medicine (TierschutzInformationsZentrum für die Biomedizinische Forschung (TIZ-BIFO), Klinikum Innenstadt, Ludwig-Maximilians-Universität (LMU) München), Munich, Germany