aDepartment of Neurology, Danish Pain Research Centre, Aarhus University Hospital, Aarhus Sygehus, Noerrebrogade 44, Aarhus 8000, Denmark
bDepartment of Neurology, Odense University Hospital, Sdr. Boulevard 29, Odense 5000, Denmark
cPain Relief Unit, Churchill Hospital, Oxford OX3 7LJ, UK
*Corresponding author. Tel.: +45 8949 3455; fax: +45 8949 3269.
1Tel.: +45 6541 2433; fax: +45 6541 3389.
2Tel.: +44 1865 225404; fax: +44 7092 160948.
3Tel.: +45 8949 3380; fax: +45 8949 3269.
4Tel.: +45 6541 2471; fax: +45 6541 3389.
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Submitted May 5, 2005; revised July 14, 2005; accepted August 8, 2005.
