RT Journal Article SR Electronic T1 Guidelines on oral anticoagulation: second edition. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 86 DO 10.1136/jcp.44.1.86-a VO 44 IS 1 A1 Smith, A G YR 1991 UL http://jcp.bmj.com/content/44/1/86.1.abstract AB