Serum Concentrations of Trace Elements in Patients with Ulcerative Colitis oleh Hamidreza Joshaghani, Taghi Amiriani, Reza Goodarzi, Honeyeh-sadat Mirkarimi, Sima Besharat, Gholamreza Roshandel, Bahar Kolasangiani, Samaneh Sadat Aghili