JOHANNESBURG (AP) — The head of the U.N. health agency has revoked his appointment of Zimbabwe's President Robert Mugabe as a "goodwill ambassador" after the choice drew widespread criticism. World Health Organization director-general Tedros Ghebreyesus last week told a conference in Uruguay on non-communicable diseases that Mugabe had agreed to be a "goodwill ambassador" on the issue. Tedros said in a statement Sunday that he had "reflected" over the past few days after flood of outrage and concern was voiced by international leaders and health experts on Mugabe's appointment.