Funding for this research was provided by:
Suomen Tuberkuloosin Vastustamisyhdistyksen Säätiö
Received: 11 December 2017
Accepted: 24 April 2018
First Online: 9 May 2018
Ethics approval and consent to participate
: Not applicable as data in this study were analysed within the epidemiological research purposes authorized by the Finnish Communicable Diseases Act 1227/2016, 42 §. Therefore, ethical approval was deemed unnecessary.
: The authors declare that they have no competing interests.
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