We enrolled 241 veterans from Operation Enduring Freedom , Operation Iraqi Freedom , and Operation New Dawn with chronic ( > 3 months ) and disabling ( Roland Morris Disability Scale score , 7 ) musculoskeletal pain of the cervical or lumbar spine or extremities ( shoulders , knees , and hips ) in the Evaluation of Stepped Care for Chronic Pain ( ESCAPE ) trial from December 20 , 2007 , through June 30 , 2011 .