Acknowledgments
We thank I. Szigeti, M. Kókai, Zs. Szendrei and B. Takács for technical assistance.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Financial support: All phases of this study were supported by Hungarian National Research Fund (OTKA 100687 (ZP); OTKA 100909 (GSR)).
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.
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Supplemental Material
The online version of this article (DOI: 10.1515/cclm-2014-0400) offers supplementary material, available to authorized users.
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