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.
1 Secondary amenorrhoea is where an established menstruation has ceasedâfor three months in a woman with a history of regular cyclic bleeding, or nine months in a woman with a history of irregular periods. 2  This usually happens to women aged 40â55.
More information about causes of Amenorrhea: 1  Medications, drugs, or substances causing Amenorrhea (12 listings) 2  Underlying causes of Amenorrhea. 3  Amenorrhea as a complication caused by other conditions.  Amenorrhea as a 1  symptom. Medical news summaries relating to Causes of Amenorrhea. 1  Pregnancy. 2  Breast feeding. 3  Exercise - might lead to skipping a period.  Stress - can cause menstrual 1  irregularity. Illness - can cause menstrual irregularity.  more causes...Â».