Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Franca Fruzzetti and Johannes Bitzer,Review of clinical experience with estradiol in combined oral contraceptives,Contraception,0010-7824,Elsevier BV,2010-01,81,1,8-15,https://cir.nii.ac.jp/crid/1363951794175833472,https://doi.org/10.1016/j.contraception.2009.08.010