RT Journal Article
SR Electronic
T1 Causal Relationships in Medicine—a Practical System for Critical Appraisal
JF Journal of Epidemiology and Community Health
JO J Epidemiol Community Health
FD BMJ Publishing Group Ltd
SP 255
OP 255
DO 10.1136/jech.44.3.255-a
VO 44
IS 3
A1 Claire Nicholl
YR 1990
UL http://jech.bmj.com/content/44/3/255.2.abstract
AB