Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated February 15, 2013 relating to the financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in °ÙÃĵ¼º½’s Annual Report on Form 10-K for the year ended December 31, 2012. We also consent to the reference to us under the heading “Experts” in such Registration Statement.
/s/ PricewaterhouseCoopers LLP
Pittsburgh, Pennsylvania
February 15, 2013