Prevalence of Chlamydia trachomatis and Neisseria gonorrhoeae in the homeless population of Medellín, Colombia: a cross-sectional study by Diego Enrique Vélez-Gómez, Natalia Torres-Vellojín, Juan Camilo Grajales-Zapata, Juan Guillermo McEwen-Ochoa, Alonso Martínez, Verónica Ramírez-Lopera, Aracelly Villegas-Castaño

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