Received: 12 May 2020
Accepted: 30 November 2020
First Online: 9 December 2020
Ethics approval and consent to participate
: Data were provided to the investigators without personal identification numbers or names. Researchers were not aware of any examinee’s identity. The Ethics Committee of the Northern Ostrobothnia Hospital District approved the study (74/2011), which was performed according to the 2013 Declaration of Helsinki, and the subgroup study presented here (227/2012).
: Consent for publication was obtained in association with consent to participate.
: The authors have no competing interests to declare.