Natalizumab and MRI monitoring

As you know MSers on natalizumab (Tysabri) who are JC virus seropositive are at risk of developing PML. Frequent MRI is being used by some neurologists to monitor for this complication. If you are on natalizumab (Tysabri) could you please complete this questionnaire?

seropositive = previous exposure to the virus, which results in antibodies being detected in the blood
PML = progressive multifocal leukoencephalopathy

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    No personal identifiers, including your computer's IP address, will be collected as part of this survey. Please note that by completing this survey you are consenting to the data you provide being analysed by Prof. Giovannoni and his collaborators. Results of this survey will be presented on this blog and may be submitted for publication.