UCSF Pain Clinical Research Center, UCSF Departments of Neurology and Anesthesia, 1701 Divisadero Street, Suite 480, San Francisco, CA, USA 94115 *Tel.:+1-415-885-7899; fax: +1-415-885-7855 E-mail: [email protected]
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Michael C. Rowbotham (2001) studied this question.
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