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About the article
Published Online: 2016-11-22
Published in Print: 2016-12-01
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission. I.S.B. conceived the idea of this study, participated in its design, collected the data, performed the analysis and wrote the initial draft of the manuscript. D.A.S. participated in the conception and design of the study, contributed to the analysis and helped to prepare the draft manuscript. R.E.K. participated in the conception and design of the study, performed genotyping and helped to prepare the draft manuscript.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(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.