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Keywords:

  • imaging agents;
  • magnetic properties;
  • magnetite;
  • nanoparticles;
  • transverse relaxivity

An error was found in the original manuscript. The phrase “and urea (0.3 mol) were added” in the first sentence of the Experimental Section is wrong. It should read “and urea (0.03 mol) were added”.

The authors sincerely apologize for this error.