References	Rationale for exclusion
Slater et al. [81]	Study did not attempt to draw a relationship between HL and LBP health outcomes
Larsen et al. [82]	Lack of significant LBP population
Khoshnevisan et al. [83]	Lack of explicit study of HL
Kim [84]	Lack of significant LBP population
Roth et al. [85]	Lack of explicit study of HL Lack of significant LBP population
Hardie et al. [86]	Lack of significant LBP population
Schulz et al. [87]	Lack of explicit study of HL
Rabenbauer and Mevenkamp [88]	Study did not attempt to draw a relationship between HL and LBP health outcomes