Sentence Correction

In my Kaplan book it says that "concerned" can be used with "about" or "with" depending on the meaning of the sentence....


....But have read in "Spideys notes" that "concerned" is used with "with" or "for" depending on the meaning....


So my question is: "corncerned" is used with "about" or with "for"??? -with "with" there is no doubt it can be used-

Thanks!!