Merki-Feld, G S Decrease in endothelin-1 plasma levels during the menstrual cycle and after ethinylestradiol treatment. [electronic resource] - Annals of internal medicine Sep 1999 - 394 p. digital Publication Type: Letter ISSN: 0003-4819 Standard No.: 10.7326/0003-4819-131-5-199909070-00019 doi Subjects--Topical Terms: AdultContraceptives, Oral--pharmacologyEndothelin-1--bloodEstradiol Congeners--pharmacologyEthinyl Estradiol--pharmacologyFemaleHumansMenstrual Cycle--blood