REFILE - CORRECTING BYLINE Drivers of mass transit system buses receive H1N1 vaccine injections at a hospital in Hefei, Anhui province November 6, 2009. Countries from China to the United States have rolled out vaccination campaigns and the rare side effects have been mild, in line with those caused by seasonal flu vaccines, World Health Organisation (WHO) spokesman Gregory Hartl said. REUTERS/Stringer (CHINA HEALTH IMAGES OF THE DAY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
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