Liability insurance provider Coverys has acquired ELM Exchange Inc., the maker of patient safety educational programs, in a move that will increase the company's offerings to physicians looking to minimize risk. Acquiring Maryland-based ELM will allow Boston's Coverys to offer the fee-based education and clinical risk management services to the 25,000 physicians, dentists and health care providers and more than 500 hospitals, health centers and clinics covered in the Coverys client base. "ELM…