GENEVA, Switzerland (AFP) — The United States (US) has still not paid off its membership fee arrears at the World Health Organization, the WHO chief said Wednesday, with Washington's intention to leave conditional on paying up. The  United Nations (UN)  health agency's director-general Tedros Adhanom Ghebreyesus said he hoped the United States would come up with the money they owe -- a self-imposed condition for quitting the organisation. US President...