PT  - JOURNAL ARTICLE
AU  - Gross, Robert A.
AU  - Johnston, Karen C.
TI  - Levels of evidence
AID  - 10.1212/01.wnl.0000342200.58823.6a
DP  - 2009 Jan 06
TA  - Neurology
PG  - 8--10
VI  - 72
IP  - 1
4099  - http://n.neurology.org/content/72/1/8.short
4100  - http://n.neurology.org/content/72/1/8.full
SO  - Neurology2009 Jan 06; 72