1. Immanuel Albertinen Klinik Rüdersdorf, University Department of Psychiatry and Psychotherapy, Brandenburg Medical School Theodor Fontane, Neuruppin, Germany
2. Center of Evidence-based Health Care, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
3. Biometry Section, Competence Center for Clinical Trials, University of Bremen, Bremen, Germany