EXHIBIT 99.3 EXHIBIT 3 POWER OF ATTORNEY Power of Attorney, dated as of January 7, 2002 for Waddell & Reed Financial Services, Inc. filed as Exhibit 3 to the Waddell & Reed Financial, Inc. 13G/A filed for Maximus, Inc. on January 16, 2002, Accession Number 0000912057-02-001518 and incorporated herein by reference. Power of Attorney, dated as of January 7, 2002 for Waddell & Reed, Inc. filed as Exhibit 3 to the Waddell & Reed Financial, Inc. 13G/A filed for Maximus, Inc. on January 16, 2002, Accession Number 0000912057-02-001518 and incorporated herein by reference. Power of Attorney, dated as of January 7, 2002 for Waddell & Reed Investment Management Company Financial Services, Inc. filed as Exhibit 3 to the Waddell & Reed Financial, Inc. 13G/A filed for Maximus, Inc. on January 16, 2002, Accession Number 0000912057-02-001518 and incorporated herein by reference.