Department of Neurology, New York University School of Medicine, Hospital for Joint Diseases, 301 East 17th Street, New York, NY 10003, USA Received 23 September 1996; revised version received 18 October 1996; accepted 6 November 1996 * Tel.: +1 212 5986194; fax: +1 212 5986009.
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Aleksandar Berić (1997) studied this question.
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