RT Journal Article SR Electronic T1 Vitamin K lowered the international normalised ratio into the therapeutic range in patients receiving warfarin JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 115 OP 115 DO 10.1136/ebm.6.4.115 VO 6 IS 4 YR 2001 UL http://ebm.bmj.com/content/6/4/115.abstract AB