5. Respond to one week of 15 mg IR prednisone and one week washout (patient worsens). Response will be measured as: >70% reduction in morning stiffness severity at the end of the first week with a >80% return of morning stiffness severity in the second week (screening procedure). This screening procedure can also be assessed in patients who have taken up to one week of >15 mg IR prednisone prior to seeing the investigator for the study, so long as informed consent is obtained before the wash-out period and all other inclusion criteria are met.