title: Erratum to: Correspondence: Some general points regarding Ledberg and Wennberg, BMC Medical Research Methodology 2014 April 27;14:58.
authors.affiliation: Southampton Statistical Sciences Research Institute, Mathematics and Medical Statistics, University of Southampton, Southampton, SO17 1BJ, UK. d.a.bohning@soton.ac.uk.
authors.forename: Dankmar
authors.initials: D
authors.lastname: Böhning
authors.affiliation: Southampton Statistical Sciences Research Institute, University of Southampton, Southampton, SO17 1BJ, UK. P.G.M.vanderHeijden@uu.nl.|Department of Methods and Statistics, Social Sciences, University of Utrecht, Utrecht, Netherlands. P.G.M.vanderHeijden@uu.nl.
authors.forename: Peter G M
authors.initials: PG
authors.lastname: van der Heijden