Text and Data Mining valid from 2019-08-28
Received: 13 June 2019
Accepted: 9 August 2019
First Online: 28 August 2019
Ethics approval and consent to participate
: The study only includes anonymised routine surveillance data. Ethical approval for analysis of such surveillance data is not required according to the Medical Association’s professional code of conduct.
: All authors read and approved the final manuscript and gave consent for publication.
: The authors declare that they have no competing interests.