PT  - JOURNAL ARTICLE
AU  - Henderson, Max
AU  - Page, Lisa
TI  - Appraising the evidence: what is selection bias?
AID  - 10.1136/ebmh.10.3.67
DP  - 2007 Aug 01
TA  - Evidence Based Mental Health
PG  - 67--68
VI  - 10
IP  - 3
4099  - http://ebmh.bmj.com/content/10/3/67.short
4100  - http://ebmh.bmj.com/content/10/3/67.full
SO  - Evid Based Ment Health2007 Aug 01; 10