Department of Neurology, University of California San Francisco, UCSF Pain Clinical Research Center, 1701 Divisadero Street, Suite 480, San Francisco, CA 94115, USA *Tel.: +1 415 885 7899; fax: +1 415 885 7855. E-mail: [email protected] Submitted October 15, 2008; revised October 23, 2008; accepted October 29, 2008.
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Michael C. Rowbotham (2008) studied this question.