EXHIBIT A AGREEMENT TO FILE JOINT ACQUISITION STATEMENTS AGREEMENT made this 8th day of January, 2008 by and between DELAWARE GROUP EQUITY FUNDS I, DELAWARE GROUP EQUITY FUNDS II, DELAWARE GROUP EQUITY FUNDS III, DELAWARE GROUP EQUITY FUNDS IV,...Agreement to File Joint Acquisition Statements • January 8th, 2008 • Delaware Management Holdings Co Inc • Investment advice
