Study to Test the Hypothesis of Non-inferior Efficacy and Safety of Ferrum Lek® (Iron (III) Hydroxide Polymaltosate), 100 mg Chewable Tablets (Lek d.d., Slovenia), as Compared With MALTOFER® (Vifor S.A., Switzerland), in Subjects With Mild and Moderate Iron Deficiency Anemia. - ICH GCP - Clinical Trials Registry