Scientists raise concern over hydroxychloroquine study

Dozens of scientists have raised concerns over a large-scale study of hydroxychloroquine and chloroquine that led to the World Health Organization suspending clinical trials of the anti-viral drugs as a potential treatment for COVID-19. Hydroxychloroquine, normally used to treat arthritis, is one of an array of drugs being tested as scientists look for potential treatments for coronavirus patients. It has also become the most high profile, partly because of comments by US President Donald Trump -- who announced this month he was taking the drug as a preventative measure against...