Irena Jakopanec*, Andrej M Grjibovski, Øivind Nilsen, Hans Blystad and Preben Aavitsland
* Corresponding author: Irena Jakopanec irena.jakopanec@guest.arnes.si
BMC Public Health 2013, 13:144 doi:10.1186/1471-2458-13-144