1 Department of Neurology, Menninger Department of Psychiatry and Behavioral Sciences, Center for Medical Ethics and Health Policy, Baylor College of Medicine, 7200 Cambridge Street, Houston, TX 77030, USA. Electronic address: kass@bcm.edu.
2 Departments of Neurology and Neurological Surgery, Peter O'Donnell Jr Brain Institute, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-8855, USA. Electronic address: michael.rubin@utsouthwestern.edu.