A Multicenter, Single-blind, Randomized Parallel-group Study to Assess the Short- and Long-term Efficacy of Certolizumab Pegol Plus Methotrexate Compared to Adalimumab Plus Methotrexate in Subjects With Moderate to Severe Rheumatoid Arthritis Responding Inadequately to Methotrexate

This study is conducted to evaluate the short (12 Weeks) and long term (104 Weeks) efficacy of Certolizumab Pegol compared with Adalimumab both in combination with Methotrexate (MTX) in the treatment of moderate to severe Rheumatoid Arthritis (RA) that is not responding adequately to MTX.