“…Since food collection was carried out mainly during winter and autumn, we could only partially account for possible seasonal variation of heavy metal content in food (Turrini et al, 2017;Vincevica-Gaile and Klavins, 2013). However, conflicting results have been reported about the existence of seasonal effects for several elements, specifically for As and Hg (Biswas et al, 2014;Copat et al, 2012;Nacano et al, 2014;Nevarez et al, 2015;Piras et al, 2015), and they have not been shown to occur for other elements (Agudo et al, 2002;Halkjaer et al, 2009;Olsen et al, 2009;Welch et al, 2009).…”