RT Journal Article
SR Electronic
T1 Biases in the observational study of β blockers in COPD
JF Thorax
JO Thorax
FD BMJ Publishing Group Ltd and British Thoracic Society
SP 1026
OP 1027
VO 63
IS 11
A1 S Suissa
A1 P Ernst
YR 2008
UL http://thorax.bmj.com/content/63/11/1026.3.abstract
AB