Environmental and Occupational Factors; Contribution and Perspectives on Difficult to Treat Asthma

*Christian Castillo Latorre, Sulimar Morales Colon, Alba D. Rivera Diaz, Vanessa Fonseca Ferrer, Mariana Mercader Perez, Ilean Lamboy Hernandez, Luis Gerena Montano, William Rodriguez Cintron and Onix Cantres Fonseca*
