Correction to: Palgrave Communications (2016) 2, Article number: 16048. doi:10.1057/palcomms.2016.48; Published 2 August 2016; Updated 13 September 2016

The affiliations of the authors Arthur Carty and Paul Dufour were listed incorrectly; these have now been corrected and read as follows:

Arthur Carty—University of Waterloo, Canada

Paul Dufour—University of Ottawa, Canada

The article has been corrected online.