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INTRODUCTIONrnLow back pain (LBP) is a common clinical symptom occurring predominantly in middle to old age.1 In 2015, the prevalence of LBP in adults worldwide was 7.3％. From 1990 to 2015, the number of people with disabilities due to LBP increased by 54％.2 In total,～40％ of the population suffers from LBP during their lifetime.