scientific article published on 26 February 2009
author: Eija Laakkonen, Urho Kujala, Jaakko Kaprio, Sarianna Sipilä, Vuokko Kovanen, Markku Alén, Paula H A Ronkainen, Jukka Puolakka, Carina Ankarberg-Lindgren, Esa Hämäläinen, Ursula Turpeinen
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