Vienna International Institute for Cryosurgery, Department of Surgery, Rudolfinerhaus, Vienna, Austria Competing Interests Declared: None. *Correspondence address: Univ-Prof Dr Nikolai N Korpan, Vienna International Institute for Cryosurgery, Department of Surgery, Rudolfinerhaus, A-1190 Vienna, Austria. email: [email protected] Submitted September 17, 2006; revised November 3, 2006; accepted November 8, 2006.
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Nikolai N. Korpan (2007) studied this question.
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