Underground Coal Mining: Relationship between Coal Dust Levels and Pneumoconiosis, in Two Regions of Colombia, 2014 von Varona Uribe, Marcela, Morgan Torres, Gloria, Checa Guerrero, Diana Milena, Briceño Ayala, Leonardo, Ibañez Pinilla, Milciades, Torres Rey, Carlos Humberto, Groot de Restrepo, Helena

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