[1] Carl von Ossietzky Univ Oldenburg, Dept Versorgungsforsch, Fak Med & Gesundheitswissensch, Oldenburg, Germany
[2] Carl von Ossietzky Univ Oldenburg, Klinikum Oldenburg, Klin Anasthesiol Intensivmed Notfallmed & Schmerz, Oldenburg, Germany
[3] Univ Bremen, Inst Publ Hlth & Pflegeforsch, Abt Versorgungsforsch, Bremen, Germany