RETRACTED: When is an oral leukoplakia premalignant?

This article has been retracted at the request of Oral Oncology and the co-author. Please see http://www.elsevier.com/locate/withdrawalpolicy . Reason: The lead author, Jon Sudbo, has been found by the Investigating Commission (appointed in January 2006 by Rikshospitalet - Radiumhospitalet MC and the University of Oslo to investigate Dr Sudbo's misconduct) to have fabricated and modified the data on which the analyses were based. The above mentioned Investigating Commission has determined that Dr Sudbo acted alone in fabricating the data. Dr Sudbo disputes the findings of the Investigating Commission. Reference: Ekbom A, Helgesen GEM, Lunde T, Tverdal A, Vollset SE, Simonsen S. Report from the Investigating Commission appointed by Rikshospitalet - Radiumhospitalet MC and the University of Oslo, January 18, 2006.