Aching backs a blooming business.
Hensley
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D000368:Aged; D000375:Aging / Q000502:physiology; D001416:Back Pain / Q000191:economics* / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D009985:Orthopedics / Q000191:economics*; D019736:Prostheses and Implants; D013131:Spine / Q000601:surgery; D014481:United States