Helavirta, Ilona http://orcid.org/0000-0003-1810-3713
Lehto, Kirsi
Huhtala, Heini
Hyöty, Marja
Collin, Pekka
Aitola, Petri
Funding for this research was provided by:
Mary and Georg Ehrnroothin säätiö
Competetive state Research financing of the expert responsibiility area of Tampere University hospital (9P060)
Article History
Accepted: 17 June 2020
First Online: 26 June 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was retrospective and observational. Therefore no ethical approval from the committee was required. The medical director of the study hospital granted approval. The study protocol conforms with the ethical guidelines of the 1975 Declaration of Helsinki (6th revision, 2008).