Eligibility for participation of this study was determined from demographic information, medical history, physical examination, electrocardiogram (ECG) and clinical laboratory tests within 3 weeks before study drug administration. Subjects suitable for this study were admitted to the Clinical Trials Center, Seoul National University Hospital on the day before dosing, and they were overnight-fasted from 10 p.m. of Day -1. Subjects were dosed study drug orally with 240 ml water around at 9 a.m. of Day 1 and they were fasted until 4 hours post-dose. Subjects performed scheduled procedures including clinical laboratory tests, electrocardiograms and pharmacokinetic samplings. During admission, subjects were served low calcium diets. Subjects were discharged on Day 2, and visited Clinical Trials Center on Day 3, Day 4 and Day 5. Study participation was terminated on post-study visit (Day 7 - 10).