title: Oral contraceptives, venous thrombosis, and varicose veins. Royal College of General Practitioners' Oral Contraception Study.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D003276:Contraceptives, Oral / Q000009:adverse effects*; D045166:Estradiol Congeners / Q000009:adverse effects; D005260:Female; D006801:Humans; D008875:Middle Aged; D045167:Progesterone Congeners / Q000009:adverse effects; D012306:Risk; D013924:Thrombophlebitis / Q000139:chemically induced* / Q000453:epidemiology; D006113:United Kingdom; D014648:Varicose Veins / Q000150:complications*
chemical_list: D003276:Contraceptives, Oral; D045166:Estradiol Congeners; D045167:Progesterone Congeners