Jääskeläinen, A
Kaila-Kangas, L
Leino-Arjas, P
Lindbohm, M-L
Nevanperä, N
Remes, J
Järvelin, M-R
Laitinen, J
Article History
Received: 1 August 2014
Revised: 18 January 2015
Accepted: 6 February 2015
First Online: 22 April 2015
Competing interests
: The authors declare no conflict of interest.