Over a three-month period, the ring slowly and concurrently releases two drugs -- Dapivirine, an antiretroviral that prevents HIV and levonorgestrel, a...
Researchers hope the sensor might one day aid drug development and drug personalization for cystic fibrosis.
Alzheimer's disease is the most common form of dementia, affecting some 47 million people worldwide.
The study involved 264 people with high blood pressure and an average age of 58.
The women, aged between 72 and 88, thought they were enrolling in a legitimate clinical trial.
"Our closest relatives are being driven rapidly towards extinction by diseases like Ebola, by commercial bushmeat hunting and by habitat loss."
The diagnostic method is fast, cheap and ultra-sensitive, and can be adapted to test for other diseases.
The research touches on a question that has occupied the minds of philosophers and scientists for centuries.
"It is very encouraging news that being physically active on just one or two occasions per week is associated with a lower risk of death."
Researchers said they had discovered a type of tumour cell which spreads cancer from organ to organ.
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