Effects of front-of-package nutrition labelling systems on objective understanding and purchase intention in Panama: results from a multi-arm parallel-group randomised controlled t... oleh Fabio S Gomes, Israel Ríos-Castillo, Leon Ramon Leal Correa, Bethy Cruzado, Carlos Felipe Urquizar Rojas, Gastón Ares Devincenzi, Elka González-Madden, Jorge Victoria