Bioavailability of selenium to Finnish men as assessed by platelet glutathione peroxidase activity and other blood parameters - Levander, O A; Alfthan, G; Arvilommi, H; Gref, C G; Huttunen, J K; Kataya, M; Koivistoinen, P; Pikkarainen, J (J Clin Nutr, 1983)