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Thanks to all those who replied. I have now located an electronic version of the article at and learnt about http://www.jstor.ac.uk/ and thus learnt about this site for the first time! Mark. ----------------------------------------------------------- Dr Mark S Gilthorpe, Principal Research Fellow & Head BioStatistics Unit, Eastman Dental Institute for Oral Health Care Science University College London, 256 Gray's Inn Road, London, WC1X 8LD Tel: +44(0)20 7915 2371; Fax: +44(0)20 7915 2372 mailto:[log in to unmask] Web: http://www.eastman.ucl.ac.uk ----------------------------------------------------------- This email represents the views of the sender alone and must not be construed as representing the views of the Eastman Dental Institute. It may contain confidential information and may be protected by law as a legally privileged document and copyright work. Its content should not be disclosed and it should not be given or copied to anyone other than the person(s) named or referenced above. If you have received this email in error, please contact the sender. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%