Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Idris A. Okewole and Ayodele O. Arowojolu and Okanlawon L. Odusoga and Olufemi A. Oloyede and Olufemi A. Adeleye and Jide Salu and Olukayode A. Dada,Effect of single administration of levonorgestrel on the menstrual cycle,Contraception,0010-7824,Elsevier BV,2007-05,75,5,372-377,https://cir.nii.ac.jp/crid/1361981469594478464,https://doi.org/10.1016/j.contraception.2007.01.019