By Kate Kelland, Health and Science Correspondent * Merck to donate 2 million doses of Gardasil HPV vaccine * Qiagen to give 250,000 tests for women aged 35-45 * Rwanda to pay “dramatically” cut price after first 3 years LONDON, April 25 (Reuters) – U.S. drugmaker Merck and German diagnostics firm Qiagen are donating millions […]