ALTERNATIVE CROP OF XFLL109.- Venezuela's President Hugo Chavez wipes his forehead as he attends a concert in his honor at the Teras Carreno theater in Caracas, Venezuela, Thursday, Feb. 23, 2012. Chavez is headed to Cuba Friday 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
ALTERNATIVE CROP OF XFLL109.- Venezuela's President Hugo Chavez wipes his forehead as he attends a concert in his honor at the Teras Carreno theater in Caracas, Venezuela, Thursday, Feb. 23, 2012. Chavez is headed to Cuba Friday 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)
ALTERNATIVE CROP OF XFLL109.- Venezuela's President Hugo Chavez wipes his forehead as he attends a concert in his honor at the Teras Carreno theater in Caracas, Venezuela, Thursday, Feb. 23, 2012. Chavez is headed to Cuba Friday 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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