TY  - RPRT
TI  - No cumulative effects for one or two previous concussions.
AU  - G L Iverson
AU  - B L Brooks
AU  - M R Lovell
AU  - M W Collins
PY  - 2006
DO  - 10.1136/bjsm.2005.020651
UR  - https://pubmed.ncbi.nlm.nih.gov/16371496/
ID  - 16371496
ER  -