Author mistake

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Revised version different from original version submitted (2002) — last modified 2004-12-16 04:51 PM

withdrawal of paper; fundamentally different revision; author mistake

Misunderstood requirements for authorship (2004) — last modified 2007-02-22 02:28 PM

authorship; author mistake; author withdrawl

Undeclared conflict of interest (2003) — last modified 2007-02-22 02:28 PM

competing interests; author mistake