DARLINGTON -Hospital officials say an outside vendor is responsible for a potential breach of patient health information after an unspecified number of old financial statements for Memorial Hospital of Lafayette County patients - some statements dating back 12 years - were mailed to third parties. The hospital contracts with an outside vendor to generate patient billing statements. "Due to an erroneous setting in the vendor's system, the system generated a number of 'zero balance' or 'aged account balance' statements relating to care provided at the hospital since 2001," the hospital said in a posting on its website dated Friday, Oct. 4.