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Contributors The initial statistical analysis was done by PD. Both authors contributed equally to writing this paper.
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.
↵i The original working paper was dated March 2014. The authors later revised it, including a response to the critique of Laverty et al.2 The original working paper can be accessed at http://www.oxyromandie.ch/files/public/docs/20140331-uzh-econwp149.pdf.
↵ii We have actually used a confidence interval of 0.996062135=0.951/13, thus the p value of 0.05 for the 13-year period.