Venezuela's President Hugo Chavez, right, waves to supporters next to National 

Venezuela's President Hugo Chavez, right, waves to supporters next to  National Congress' President Diosdado Cabello, left, as he attends a concert in his honor atTeresa Carreno theater  in Caracas, Venezuela, Thursday, Feb. 23, 2012. Chavez is headed to Cuba for surgery to remove a potentially cancerous tumor while the nation's congress on Thursday unanimously approved permission for Chavez to leave, a formality required by the nation's constitution. (AP Photo/Fernando Llano)
Associated Press
Venezuela's President Hugo Chavez, right, waves to supporters next to National Congress' President Diosdado Cabello, left, as he attends a concert in his honor atTeresa Carreno theater in Caracas, Venezuela, Thursday, Feb. 23, 2012. Chavez is headed to Cuba for surgery to remove a potentially cancerous tumor while the nation's congress on Thursday unanimously approved permission for Chavez to leave, a formality required by the nation's constitution. (AP Photo/Fernando Llano)
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