1. Swiss Paraplegic Research, Nottwil, Switzerland
2. Public Health and Primary Care Library, University Library of Bern, University of Bern, Bern, Switzerland
3. Medical Library, University Library of Bern, University of Bern, Bern, Switzerland
4. Institute of Social and Preventive Medicine, University of Bern, Switzerland
5. Center for Primary and Community Care, Faculty of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland