{{Cite journal| doi = 10.1097/00005373-200206000-00003| issn = 0022-5282 (Print) 0022-5282 (Linking)| volume = 52| issue = 6| pages = 1030–6| last = Osterwalder| first = J. J.| title = Could a regional trauma system in eastern Switzerland decrease the mortality of blunt polytrauma patients? A prospective cohort study| journal = J Trauma| date = 2002-06-05| pmid = 12045627}}