Silicosis, tuberculosis time bomb?
a Pulmonology Department, Centro Hospitalar Tondela-Viseu, Portugal
b Faculty of Sciences, Department of Mathematics, University of Porto, Portugal
c Centre for Mathematics of the University of Porto, Portugal
d EPIUnit Institute of Public Health, University of Porto, Portugal
e Chest Disease Centre Vila Nova de Gaia, Portugal
f Pulmonology, Centro Hospitalar de Vila Nova de Gaia/Espinho EPE, Portugal
g Department of Clinical Epidemiology, Predictive Medicine and Public Health, University of Porto Medical School, Portugal