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Compared with the BMMNC i.v. Group, the collateral vessel formation in the Bubble + US + BMMNC i.v. and BMMNC i.m. Groups were very obvious, respectively, enhancing 4.2 ± 0.2-fold and 4.3 ± 0.2-fold; the Bubble + US Group was 1.8 ± 0.1-fold, being much less than Bubble + US + BMMNC i.v. Group; Control Group was an equal degree. Adapted from [46].
