1. Use of recombinant human chorionic gonadotropin in ovulation induction
M.ichael Ludwig, MD, Kevin J Doody, MD, Kathleen M Doody, MD 
Fertility and Sterility 
Volume 79, Issue 5, Pages (May 2003)
DOI: /S (03)

2. FIGURE 1
Time from injection of hCG (6,000 IU IM) to follicle rupture in an IUI cycle. Evaluation of 37 cycles in 32 women. Data according to (8).
Ludwig. Recombinant hCG. Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )

3. FIGURE 2
Course of hCG serum concentration after administration of 5,000 IU r-hCG (250 μg) and 5,000 IU u-hCG. Reprinted with permission from (22).
Ludwig. Recombinant hCG. Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )