Acknowledgments
We would like to thank Ma Yi (biostatistician at Christchurch Hospital) for her assistance in analysing the data.
Author contributions: All authors were involved in designing the study. JBR researched the literature, analysed the data and wrote the first draft of the manuscript. All authors reviewed and edited the manuscript and approved the final version of the manuscript.
Financial support: PMG, BD provided sample tubes for the study but were not involved in the study design, data collection or analysis.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organisation(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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Supplemental Material
The online version of this article (DOI: 10.1515/cclm-2014-0537) offers supplementary material, available to authorized users.
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