title: Response.
authors.forename: Stacey J
authors.initials: SJ
authors.lastname: Ackerman
authors.forename: David W
authors.initials: DW
authors.lastname: Polly
mesh_terms: D003695:Delivery of Health Care / Q000706:statistics & numerical data*; D005260:Female; D017048:Health Care Costs; D006801:Humans; D017116:Low Back Pain / Q000628:therapy*; D008297:Male; D006278:Medicare / Q000191:economics*; D012446:Sacroiliac Joint / Q000473:pathology*; D058566:Sacroiliitis / Q000628:therapy*