"Resistance" to warfarin due to unrecognized vitamin K supplementation.
D000368:Aged; D004351:Drug Resistance; D005260:Female; D005527:Food, Fortified / Q000009:adverse effects / Q000032:analysis*; D006801:Humans; D014812:Vitamin K / Q000008:administration & dosage* / Q000009:adverse effects / Q000032:analysis; D014859:Warfarin / Q000037:antagonists & inhibitors* / Q000494:pharmacology
D014812:Vitamin K; D014859:Warfarin