Sept 13 (Reuters) - A group led by private equity firm KKR & Co Inc has called off its cash-and-stock deal that values Australian hospital operator Ramsay Health Care at around $14.5 billion, the Australian Financial Review reported, citing sources. (https://bit.ly/3eJ6Eee) (Reporting by Sameer Manekar in Bengaluru; Editing by Maju Samuel)