1. Riga Stradins University; Medical faculty; Department of Occupational and Environmental Medicine; web-page: www.rsu.lv/avmk ;

2. Institute of Experimental medicine (St. Petersburg), Ivan Pavolv’s Department of physiology, web-page: http://iemrams.spb.ru/english/infoeng.htm ;

3 . Frontiers in Neuroscience; Frontiers Editorial Office; Science Park PSE-D,CH – 1015, Lausanne,Switzerland : web-page: www.frontiersin.org .