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Footnotes
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Contributors MK and KM conceived and designed the study. MK and PH collected the data. PH supervised the collection of data and also obtained the ethical approval. KM provided statistical expertise. MK drafted the manuscript. All authors critically revised the manuscript for important intellectual content and approved the final revised version.
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Funding The Swedish Medical Products Agency, Selander's fund, the Swedish Heart-Lung Foundation, the Swedish Research Council, Uppsala County Council Research Fund, and Thuréus foundation. The funding agencies had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
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Competing interests None.
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Ethics approval Granted from the regional ethical review board, Uppsala, Sweden (2011/231).
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Provenance and peer review Not commissioned; externally peer reviewed.