Expression of Concern: Zinc Supplementation and the Effects on Pregnancy Outcomes in Gestational Diabetes: a Randomized, Double-blind, Placebo-controlled Trial - Karamali, M.; Heidarzadeh, Z.; Seifati, S.-M.; Samimi, M.; Tabassi, Z.; Talaee, N.; Bahardoost, H.; Asemi, Z. (Experimental and Clinical Endocrinology & Diabetes, 2016)