Connecticut-based Middlesex Hospital has launched a new online "waiting time clock" for its three facilities in Middletown, Marlborough, and Essex, allowing patients to see which one has the longest "door-to-doctor" wait and then drive to the medical center that promises the quickest response. The new service is based on a similar service at a New Orleans hospital with six emergency room locations. Studies there showed that patients frequently would change their destination to an emergency room with the shortest waits.