progesterone (P4), as well as dehydroepiandrosterone
(DHEA) were measured by a Microplate Enzyme
Immunoassay kit (sensitivity=6.5 pg/mL, Monobind Inc.,
USA), an enzyme-linked immunosorbent (ELISA) assay
kit (sensitivity=0.1 ng/mL, DiaPlus Inc., USA), and a
Microplate Enzyme Immunoassay kit (sensitivity=0.04
mg/mL, Monobind Inc., USA), respectively. On the last
day of culture, half of the culture media was collected.