Abstract
The original version of this article unfortunately contained few mistakes. Under the subheading Data extraction and review process, in line 12 the word prospective is incorrectly given by the author. The correct word is retrospective. In Fig.2D, the label should read as RA instead of LA. In Table6, the word ischemic/gangrenous should read as ischemia/gangrene in 9th row, column 6. The revised Fig 2 and Table 6 are available in the correction article.