Erik Andersson*, Brjánn Ljótsson, Filip Smit, Björn Paxling, Erik Hedman, Nils Lindefors, Gerhard Andersson and Christian Rück
* Corresponding author: Erik Andersson erik.m.andersson@ki.se
BMC Public Health 2011, 11:215 doi:10.1186/1471-2458-11-215
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