Raj, Rahul
Seppä, Karri
Luostarinen, Tapio
Malila, Nea
Seppälä, Matti
Pitkäniemi, Janne
Korja, Miikka http://orcid.org/0000-0002-4463-6954
Article History
Received: 15 December 2019
Accepted: 8 February 2020
First Online: 14 February 2020
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: The Helsinki University Hospital’s research committee (HUS/356/2017 §107) and the National Institute for Health and Welfare THL (THL/1009/6.02.00/2018) approved the present study. We conducted this study according to Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guidelines (Online Resource 1).