persistent vegetative state http://www.nejm.org/doi/full/10.1056/NEJM199405263302107 CrossRef persistent vegetative state. http://www.nejm.org/doi/full/10.1056/NEJM199405263302107 CrossRef http://www.nejm.org/doi/full/10.1056/NEJM199405263302107 http://www.nejm.org/doi/full/10.1056/NEJM199405263302107