"This article is not available online as a final peer reviewed draft until March 2008.

You may contact the author for a personal copy to be sent to you. costas.karageorghis@brunel.ac.uk

Publisher:	 Georg Thieme Verlag	
Pre-print:	 cross  author cannot archive pre-print (ie pre-refereeing)	
Post-print:	 tick  subject to Restrictions below, author can archive post-print (ie final draft post-refereeing)	
Restrictions:	
12 months

Conditions:	Institutional Repository (including PubMed Central)
Publisher's version/PDF cannot be used
Publisher copyright and source must be acknowledged
Link to Publisher version (www.thieme-connect.com) must be included if article has been published online"