<p>Some of continent’s biggest pharma firms write to national leaders calling for action to safeguard their futures</p><p>Some of Europe’s biggest pharmaceutical companies have said the continent is “losing ground” to rivals including the US and China in developing new drugs and attracting investment.</p><p>The chairs of nine companies, including Britain’s AstraZeneca, GSK and Denmark’s Novo Nordisk, wrote to Andy Burnham and the national leaders of other European countries on Tuesday to call fo