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Figure 2 Exercise endurance, as assessed by the 6-min walk test, significantly increased after BDAS (from 107 ± 127 to 217 ± 108 m, n = 14, p < 0.001). A further improvement in exercise endurance (from 191 ± 101 to 284 ± 73 m, n = 10, p < 0.05 by the Bonferroni correction [15]) was also demonstrated at long-term evaluation.