By Emma Farge GENEVA (Reuters) – Ukraine, backed by dozens of other countries, has written to the World Health Organization’s regional chief calling for an urgent meeting on the impact of Russia’s invasion on health and healthcare, a letter obtained by Reuters on Friday showed. The letter, sent this week by Ukraine’s diplomatic mission in Geneva, Switzerland, where the WHO is headquartered, is signed by some 38 other members of the agency’s European region, including France, Germany and Britain. Addressed to Europe regional director Hans Kluge, it urged him to convene a meeting “no later than …