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Article History

Received: 20 April 2017

Accepted: 19 February 2018

First Online: 27 February 2018

Ethics approval and consent to participate

: The local ethics committee of the Hospital District of Northern Ostrobothnia (144/2011, amendment 23.2.2015) and the Finnish National Supervisory Authority for Welfare and Health (1339/05.01.00.06/2009) approved the study design. Based on ethics committee of the Hospital District of Northern Ostrobothnia approval, written informed consent was not obtained from the patients at the time of sample donation.

: Not applicable

: The authors declare that they have no competing interests.

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