Funding for this research was provided by:
Axel Muusfeldts Fond
Familien Hede Nielsens Fond
Rosalie Petersens Fond
Christian Larsen og Dommer Ellen Larsens legat
Else og Mogens Wedell-Wedellsborgs fond
AP Møller Fonden - Fonden til Lægevidenskabens fremme
Ole Kirks fond
Text and Data Mining valid from 2018-12-01
Received: 13 February 2018
Accepted: 27 November 2018
First Online: 10 December 2018
: CHS, KRM, TGV and PVB is employed at the Statens serum Institut responsible for the Danish national surveillance of infectious disease epidemiology and vaccination coverage of the Danish childhood vaccination programme.
: The study is purely register-based and was notified to the Danish Data Protection Agency. Ethics approval and participant consent was not necessary according to Danish legislation.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.