Improving COVID-19 vaccine uptake: a message co-design process for a national mHealth intervention in Colombia by Nathaly Aya Pastrana, Sandra Agudelo-Londoño, Oscar Franco-Suarez, Jessica Otero Machuca, Deivis Nicolás Guzman-Tordecilla, María Camila López Sánchez, Mariana Rodriguez-Patarroyo, Cristhian Alejandro Rivera-Sánchez, Daniella Castro-Barbudo, Antonio J. Trujillo, Vidhi Maniar, Andres I. Vecino-Ortiz

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