Glycosylation of immunoglobulin g: role of genetic and epigenetic influences by Menni, C, Keser, T, Mangino, M, Bell, J, Erte, I, Akmačić, I, Vučković, F, Pučić Baković, M, Gornik, O, McCarthy, M, Zoldoš, V, Spector, T, Lauc, G, Valdes, A