Department of Complementary Medicine, Postgraduate Medical School, University of Exeter, 25 Victoria Park Road, Exeter EX2 4NT, UK *Corresponding author. Tel.: +44 1392 430802; fax: +44 1392 424989; e-mail: [email protected] Received November 28, 1996; revised version received February 5, 1997; accepted February 5, 1997.
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Ernst et al. (1997) studied this question.