Submitted on: 11 January 2001.
Revised on: 17 February 2001.
Accepted on: 07 March 2001.
Multiple Sclerosis Journal---SAGE PUBLICATIONS LTD
http://reply.papertrans.cn/3/225/22408/22408-12.png
http://reply.papertrans.cn/3/225/22408/22408-13.png
http://reply.papertrans.cn/3/225/22408/22408-14.png
http://reply.papertrans.cn/3/225/22408/22408-15.png
http://reply.papertrans.cn/3/225/22408/22408-16.png
http://reply.papertrans.cn/3/225/22408/22408-17.png
http://reply.papertrans.cn/3/225/22408/22408-18.png
Submitted on: 08 March 2007.
Revised on: 18 April 2007.
Accepted on: 29 April 2007.
Multiple Sclerosis Journal---SAGE PUBLICATIONS LTD
http://reply.papertrans.cn/3/225/22408/22408-20.png