Editing Concussion (section)

===Costs===
Due to the lack of a consistent definition, the economic costs of mTBI are not known, but they are estimated to be very high.<ref name="BorgWHO">{{cite journal | vauthors = Borg J, Holm L, Peloso PM, Cassidy JD, Carroll LJ, von Holst H, Paniak C, Yates D | display-authors = 6 | title = Non-surgical intervention and cost for mild traumatic brain injury: results of the WHO Collaborating Centre Task Force on Mild Traumatic Brain Injury | journal = Journal of Rehabilitation Medicine | volume = 36 | issue = 43 Suppl | pages = 76–83 | date = February 2004 | pmid = 15083872 | doi = 10.1080/16501960410023840 | doi-access = free }}</ref> These high costs are due in part to the large percentage of hospital admissions for head injury that is due to mild head trauma,<ref name="LevinHS"/> but indirect costs such as lost work time and early retirement account for the bulk of the costs.<ref name=BorgWHO/> These direct and indirect costs cause the expense of mild brain trauma to rival that of moderate and severe head injuries.<ref name=Silver05>{{cite book|vauthors=Kraus JF, Chu LD |chapter=Epidemiology |veditors=Silver JM, McAllister TW, Yudofsky SC |year=2005 | title=Textbook of Traumatic Brain Injury |publisher=American Psychiatric Pub., Inc |isbn=978-1-58562-105-7 |page=23}}</ref>