aDepartment of Neurology, University of California, UCSF Pain Clinical Research Center, 1701 Divisadero Street, Suite 480, San Francisco, CA 94115, USA bDepartment of Anesthesia, University of California, UCSF Pain Clinical Research Center, 1701 Divisadero Street, Suite 480, San Francisco, CA 94115, USA *Corresponding author. Tel.: +1-415-885-7899; fax: +1-415-885-7855 E-mail: [email protected] Received 2 April 2001; accepted 19 April 2001.
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Rowbotham et al. (2001) studied this question.
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