Hong Kong authorities have arrested a 28-year-old man in charge of a clinic accused of selling a laboratory reagent as a bogus vaccine against more than 20 types of cancer. The arrest followed a joint operation by the Department of Health and police, during which investigators raided 13 premises linked to the company, said Frank Chan Ling-fung, an assistant director of health who oversees drug matters. Chan said there had been no reports of illness among people who had received the so-called...