1. Low-dose human chorionic gonadotropin therapy can improve sensitivity to exogenous follicle-stimulating hormone in patients with secondary amenorrhea 
Marco Filicori, M.D., Graciela E Cognigni, M.D., Stefania Taraborrelli, M.D., Daniela Spettoli, M.D., Walter Ciampaglia, M.D., Cristina Tabarelli de Fatis, M.D. 
Fertility and Sterility 
Volume 72, Issue 6, Pages (December 1999)
DOI: /S (99)

2. FIGURE 1
The dosages of menotropins and levels of estrogen during treatment in a hypogonadal patient. (A), Administration of highly purified FSH alone. (B), Supplementation of highly purified FSH with low-dose hCG therapy (50 IU/d). Amps = ampules; HP = highly purified.
Filicori. Human chorionic gonadotropin. Fertil Steril 1999.
Fertility and Sterility  , DOI: ( /S (99) )