8McBeth J, Jones K.Epidemiology of chronic musculoskeletal pain. Best Pract Res Clin Rheumatol. 2007;21 (3):403-425.
9Dagenais S, Caro J, Haldeman S. A systematic review of low back pain cost of illness studies in the United States and Internationally.Spine J. 2008;8(1):8-20.
10Yang H, Cao C, Wu C, et al. TGF-betal suppresses inflammation in cell therapy for intervertebral disc degeneration. Sci Rep. 2015,5:13254.