title: Risk of oral contraceptives and recency of market introduction.
authors.forename: J P
authors.initials: JP
authors.lastname: Vandenbroucke
authors.forename: K W
authors.initials: KW
authors.lastname: Bloemenkamp
authors.forename: F M
authors.initials: FM
authors.lastname: Helmerhorst
authors.forename: F R
authors.initials: FR
authors.lastname: Rosendaal
mesh_terms: D000293:Adolescent; D000328:Adult; D003280:Contraceptives, Oral, Synthetic / Q000008:administration & dosage*; D017135:Desogestrel / Q000008:administration & dosage; D005260:Female; D006801:Humans; D016912:Levonorgestrel / Q000008:administration & dosage; D009644:Norgestrel / Q000008:administration & dosage / Q000031:analogs & derivatives; D009652:Norpregnenes / Q000008:administration & dosage; D016017:Odds Ratio; D013997:Time Factors
chemical_list: D003280:Contraceptives, Oral, Synthetic; D009652:Norpregnenes; C033273:Gestodene; D009644:Norgestrel; D016912:Levonorgestrel; D017135:Desogestrel; C017576:norgestimate