Analgesic Research, Needham, MA Supported by Analgesic Research, Needham, MA. Reprints: Nathaniel Katz, MD, MS, Analgesic Research, 109 Highland Avenue, Needham, MA 02494 (e-mail: [email protected]). Received for publication January 23, 2007; accepted January 23, 2007
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Nathaniel P. Katz (2007) studied this question.
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