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Contributors RN planned the study and wrote the manuscript. PHT, AAT and M-HT contributed to the content. HHL performed the statistical analysis. NT and SO contributed the cases.
Funding This study was supported in part by Grants-in-Aid for Clinical Research from the National Hospital Organization.
Competing interests None.
Ethics approval This study was approved by the ethics committee at Shikoku Cancer Center.
Provenance and peer review Not commissioned; externally peer reviewed.
▸ Additional data are published online only. To view this file please visit the journal online (http://dx.doi.org/10.1136/jclinpath-2014-202215)