Kannus, Pekka
Parkkari, Jari
Niemi, Seppo
Sievänen, Harri
Funding for this research was provided by:
Competitive State Research Financing of the Expert Responsibility Area of Tampere University Hospital, Tampere, Finland (9V015)
Article History
Received: 5 February 2018
Accepted: 24 March 2018
First Online: 24 April 2018
Compliance with ethical standards
:
: The authors have no conflicts of interest.
: As a register-based blinded analysis, the study did not have identifiable individual participants. Therefore, according to the Finnish Law of the Medical Research, it did not need ethical approval. Permission to use the Finnish National Hospital Discharge Register for the present study was provided by the National Institute for Health and Welfare, Helsinki, Finland.
: As a register-based blinded analysis, the study did not have identifiable individual participants and thus informed consent was not obtained.