RT Journal Article
SR Electronic
T1 Hierarchy of evidence and grading of recommendations
JF Thorax
JO Thorax
FD BMJ Publishing Group Ltd and British Thoracic Society
SP i13
OP i14
VO 59
IS suppl 1
YR 2004
UL http://thorax.bmj.com/content/59/suppl_1/i13.abstract
AB