Stefan Panaiotov, Ivan Simeonovski, Victoria Levterova, Ventzislav Karamfilov, Nadia Brankova, Kristin Tankova, Katrina Campbell, Pauline Jacob, Karim Helmi, Bas Boots, Emilio D’Ugo, Stefania Marcheggiani, Laura Mancini, Ulrich Breitenbach, Erik Mielke, Todor Kantardjiev
Int J Environ Res Public Health. 2015 Jul; 12(7): 7430–7443. Published online 2015 Jun 30. doi: 10.3390/ijerph120707430