1. Health Policy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
2. Department of Neurology and Psychiatry, St Louis University, St Louis, MO, USA
3. Department of Radiology, Tehran University of Medical Sciences, Tehran, Iran
4. Cardiovascular Health Institute, Tri-City Medical Center, Oceanside, CA, USA
5. Department of Surgery, Oklahoma State University, Tulsa, OK, USA
6. Department of Neurology, Neurosurgery and Radiology, Medical College of Wisconsin, Milwaukee, WI, USA