Aetna Inc. and Jefferson Hospital said Wednesday they signed a two-year contract renewal, ending a dispute that threatened to block in-network access to the hospital for thousands of patients in the South Hills region of Pittsburgh. Spokesmen for Aetna and Allegheny Health Network, which owns Jefferson, said they were pleased to have resolved the conflict. Neither would disclose details of the contract. "We are very pleased that Aetna members will be able to continue receiving in-network access to care at Jefferson Regional and across Allegheny Health Network without disruption," Aetna spokesman Walt Cherniak said.