The percentage of patients achieving a physician's global assessment (PGA) of clear or almost clear after at least 12 weeks of adalimumab will be calculated for patients who had shown an unsatisfactory response to 3 months of etanercept at 50 mg twice a week without dose reduction as well as for patients who had shown an unsatisfactory response to 3 months of etanercept at 50 mg twice a week followed by 50 mg once a week.