Following an FDA letter issued Thursday Aug. 10 to health care providers about possible risks with liquid-filled intragastric balloons, Apollo Endosurgery Inc. held a call on Friday to address the letter. During the call, executives with Apollo, maker of the Orbera intragastric balloon system, discussed the FDA letter regarding unexpected deaths of five patients who had received the balloons, though their deaths were not determined to be the result of the devices, said the company.