title: Quality concerns of over-the-counter vitamin K supplements: implications for warfarin therapy.
authors.affiliation: Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada.
authors.forename: William R
authors.initials: WR
authors.lastname: Bartle
authors.forename: Nancy
authors.initials: N
authors.lastname: Presse
authors.forename: Guylaine
authors.initials: G
authors.lastname: Ferland
mesh_terms: D000925:Anticoagulants / Q000627:therapeutic use; D019587:Dietary Supplements; D006801:Humans; D004366:Nonprescription Drugs; D011786:Quality Control; D014812:Vitamin K; D014859:Warfarin / Q000627:therapeutic use
chemical_list: D000925:Anticoagulants; D004366:Nonprescription Drugs; D014812:Vitamin K; D014859:Warfarin