Retraction: Innate Immune Activation by Inhaled Lipopolysaccharide, Independent of Oxidative Stress, Exacerbates Silica-Induced Pulmonary Fibrosis in Mice

• David M. Brass, 
• Jennifer C. Spencer, 
• Zhuowei Li, 
• Erin Potts-Kant, 
• Sarah M. Reilly, 
• Mary K. Dunkel, 
• Joseph D. Latoche, 
• Richard L. Auten, 
• John W. Hollingsworth, 
• Cheryl L. Fattman