were monitored and measured by freezing the
images and using callipers. Based on the size measurements,
follicular dynamics were estimated. Ovulation was
judged to have occurred if the dominant largest follicle(s)
monitored by US could not be detected at the next examination,
corpus luteum development was seen during subsequent
examinations, and this was confirmed by a
subsequent increase in P4 concentration [26]. All structures
in the ovaries of more than 2.5 cm in diameter, and
persisted for more than 10 days, were considered to be
cysts [28].