1. Magnitude and variability of sequential estradiol and progesterone concentrations in women using depot medroxyprogesterone acetate for contraception 
M.Kathleen Clark, Ph.D., MaryFran Sowers, Ph.D., Barcey T Levy, M.D., Ph.D., Patricia Tenhundfeld, B.S. 
Fertility and Sterility 
Volume 75, Issue 5, Pages (May 2001)
DOI: /S (01)

2. Figure 1
Random sample of 5 of the 11 subjects who exhibited a flat estradiol pattern across the DMPA injection interval (○ = subject 1; • = subject 5; □ = subject 8; ▵ = subject 19; ∗ = subject 31).
Clark. DMPA, estradiol, and progesterone. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (01) )

3. Figure 2
Random sample of 5 of 20 women who exhibited a variable estradiol pattern across the DMPA injection interval (○ = subject 7; • = subject 18; □ = subject 21; ▵ = subject 13; ∗ = subject 26).
Clark. DMPA, estradiol, and progesterone. Fertil Steril 2001.
Fertility and Sterility  , DOI: ( /S (01) )