Five hospitals in Maine have formed the Maine Rural Health Collaborative LLC with a goal of preserving and enhancing health care within the communities they serve. The hospitals are: Northern Maine Medical Center in Fort Kent, Cary Medical Center in Caribou, Houlton Regional Hospital, St. Joseph Hospital in Bangor and Mount Desert Island Hospital in Bar Harbor. The collaborative was formally announced at a March 12 meeting of the five hospital CEOs and members of their boards of directors in Bangor. Tom Moakler, chief executive officer at Houlton Regional Hospital, said the move comes at a period of change in health care.