TOPSHOT - A volunteer of the "Aid and Freedom Coalition" movement takes a child's measurements during a medical attention camp in the Macarao neighbourhood in Caracas, on February 17, 2019. - Venezuelan opposition leader and self declared acting president Juan Guaido set a goal Sunday of enlisting a million volunteers within a week to confront a government blockade that has kept tons of humanitarian aid, most of it from the United States, from flowing into the country. (Photo by Yuri CORTEZ / AFP)