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(A) Corrosion topographies, (B) mass loss, (C) mass loss ratio and (D) corrosion rate of the Mg–1Zn–1Sn-xSr alloys after subcutaneous implantation for 7, 15, and 30 days. Values are the mean ± SD, n = 4. *p < 0.05, **p < 0.01 and ***p < 0.001.
