scientific article published on 12 April 2011
author: Eija Laakkonen, Sarianna Sipilä, Yrjö Konttinen, Vuokko Kovanen, Markku Alén, Paula H A Ronkainen, Harri Suominen, Jukka Puolakka, Carina Ankarberg-Lindgren, Esa Hämäläinen, Ursula Turpeinen
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