If you mean aerial drones, some number more than 670,000 UAVs have been registered by the FAA. It has been estimated that something like 1 million will be flying by the New Year 2018. I guess that some 50 industries use drones with something like 30,000+ women and men learning to be commercial, etc pilots.
Amenorrhea is the medical term for the absence of menstruation. âSecondaryâ refers to menstruation that has occurred at least once but has stopped, typically for six months or longer. This is different from primary amenorrhea, a condition in which a woman does not have her first period by the age of 16.
Secondary Amenorrhea: Definition and causes. Secondary Amenorrhea. Secondary amenorrhea is the absence of menstrual bleeding in a woman who. has been menstruating normally but later stops menstruating for 3 or. more months. Furthermore, there must be none of the known physiologic or drug-induced causes of amenorrhea.