Paris (AFP) - Dozens of scientists have raised concerns over a large-scale study of hydroxychloroquine and chloroquine published in the Lancet 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, has become one of the most high profile drugs being tested for use against the new coronavirus. This is partly because of comments by public figures including US President Donald Trump, who announced this month he was taking the drug as a preventative measure. In research published in the Lancet on May 22,...