Systematic literature review of instruments that measure the healthfulness of food and beverages sold in informal food outlets von Medina, Catalina, Piéa-Pozas, Maricela, Aburto, Tania C, Chavira, Julissa, López, Uzzi, Moreno, Mildred, Olvera, Armando G, Gonzalez, Citlali, Huang, Terry T-K, Barquera, Simón

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