Fatigue and Sleep-related Impairment as Predictors of the Effect of Nonpharmacological Therapies for Active duty Service Members With Chronic Pain: A Secondary Analysis of a Pragmatic Randomized Clinical Trial. - Wi D; Steffen AD; Flynn DM; Ransom JC; Orr KP; McQuinn HM; Snow TJ; Burke LA; Park C; Doorenbos AZ (Military medicine, 2025)