1. Department of Infectious Diseases and Hospital Hygiene, Kantonsspital Aarau, Switzerland
2. Department of Neurosurgery, Inselspital Bern, Switzerland
3. Department of Neurosurgery, University Hospital Geneva, Switzerland
4. Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Neurosurgery, Berlin, Germany
5. Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Centre for Musculoskeletal Surgery, Berlin, Germany