1. University of Virginia; Department of Neurology; Charlottesville Virginia 22908 USA
2. University of Rochester; Rochester New York USA
3. Hanamaki General Hospital; Hanamaki Japan
4. Toronto General Hospital; Toronto Canada
5. Duke University; Durham North Carolina USA
6. University at Buffalo; SUNY Buffalo New York USA
7. University of Alabama, Birmingham; Birmingham Alabama USA
8. Neurological Institute; Kyushu University; Fukuoka Japan
9. Tokyo Medical University; Tokyo Japan
10. Institute of Neurological Sciences; Southern General Hospital; Glasgow Scotland
11. Institut de Myologie; GH Pitié-Salpêtrière; Paris France
12. Shariati Hospital; Tehran University of Medical Sciences; Tehran Iran
13. The First Affiliated Hospital; Sun Yat-sen University; Guangzhou Guangdong Province PRC China