1. Levonorgestrel effects on serum androgens, sex hormone–binding globulin levels, hair shaft diameter, and sexual function 
George Kovalevsky, M.D., Susan A. Ballagh, M.D., Frank Z. Stanczyk, Ph.D., Jennifer Lee, B.S., Joann Cooper, B.S., David F. Archer, M.D. 
Fertility and Sterility 
Volume 93, Issue 6, Pages (April 2010)
DOI: /j.fertnstert
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1 CONSORT flow chart.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions