Correction: Novel Combination of Sorafenib and Celecoxib Provides Synergistic Anti-Proliferative and Pro-Apoptotic Effects in Human Liver Cancer Cells

• Melchiorre Cervello, 
• Dimcho Bachvarov, 
• Nadia Lampiasi, 
• Antonella Cusimano, 
• Antonina Azzolina, 
• James A. McCubrey, 
• Giuseppe Montalto