Multi-Center Open Label Study to Evaluate the Safety, Tolerability and Efficacy of Tocilizumab in Patients With Active Rheumatoid Arthritis on Background Non-biologic DMARDs Who Have An Inadequate Response to Current Non-Biologic DMARD or Anti-TNF Therapy Read more about Multi-Center Open Label Study to Evaluate the Safety, Tolerability and Efficacy of Tocilizumab in Patients With Active Rheumatoid Arthritis on Background Non-biologic DMARDs Who Have An Inadequate Response to Current Non-Biologic DMARD or Anti-TNF Therapy