After much investigation, we realized that there is a flaw in Figures 2 and 5. However, this correction does not change and alter the results of this study. We certify that these changes do not affect the results and conclusion, and happened by mistake. The correct results are shown below.
Figure 2.
TEM images of (C, right panel) Fe3O4 and (D, left panel) HPG@Fe3O4 nanoparticles.
Figure 5.

HeLa cell line’s optical microscopy images related to (A) before and (B) after MTT treatment. L929 cell line’s optical microscopy images related to (C) before and after (D) MTT.
The TEM and the cellular microscopy images were wrongly placed in Figures 2 and 5, respectively, and should be replaced with the new images.

