Funding for this research was provided by:
The Danish Research Council (09-067124)
Intramural Research Program of The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health (HHSN275201000020C)
Received: 20 March 2017
Accepted: 2 January 2018
First Online: 12 January 2018
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving human subjects were approved by the National Committee on Health Research Ethics in 57 Denmark (H-4-2011-045). Written informed consent was obtained from all subjects.
: Not applicable
: The authors declare that they have no competing interests.
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