silica/fatigue

Pneumoconiosis is a fibrotic pulmonary disease resulting from workplace exposure to hazardous dusts containing free silica or asbestos, which causes irreversible progressive respiratory impairment among the sufferers. These patients may experience disabling symptoms (e.g. progressive severe dyspnea,

Four groups of subjects will be recruited: 1. Subjects meeting the definition for RRMS by the International Panel Criteria, who are active, as defined by at least one MS relapse in the past 12 months, or at least one gadolinium enhancing lesion on Magnetic Resonance Imaging (MRI) within 3 months of