title: WITHDRAWN: Letter to the editor.
abstract: This article has been withdrawn at the request of the author. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
authors.affiliation: Visiting Professor, University of Newcastle, Toxico-Logical Consulting Ltd., Gravesend Farm, Albury, Ware, Herts SG112LW, UK.
authors.forename: Andrew
authors.initials: A
authors.lastname: Cockburn