Vainio, Eeva J
Müller, Michael M
Korhonen, Kari
Piri, Tuula
Hantula, Jarkko
Article History
Received: 4 December 2013
Revised: 6 May 2014
Accepted: 7 July 2014
First Online: 15 August 2014
Change Date: 20 January 2015
Change Type: Correction
Change Details: This article has been corrected since Advance Online Publication and a corrigendum is also printed in this issue
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.