Salonen, Anne
Lahti, Leo
Salojärvi, Jarkko
Holtrop, Grietje
Korpela, Katri
Duncan, Sylvia H
Date, Priya
Farquharson, Freda
Johnstone, Alexandra M
Lobley, Gerald E
Louis, Petra
Flint, Harry J
de Vos, Willem M
Article History
Received: 7 October 2013
Revised: 1 February 2014
Accepted: 12 March 2014
First Online: 24 April 2014
Competing interests
: The authors declare no conflict of interest.