title: [Introduction to the topic: difficult and imponderable times].
authors.affiliation: UPZ, Landgraf-Georg-Strasse 100, 64287, Darmstadt, Germany. e.h.jonitz@t-online.de
authors.forename: H
authors.initials: H
authors.lastname: Jonitz
mesh_terms: D005858:Germany; D017063:Outcome Assessment, Health Care / Q000639:trends*; D011331:Private Practice / Q000639:trends*; D014572:Urology / Q000639:trends*