Double-blind Comparative Study of SYR-472

Inclusion Criteria: 1. The participant is an outpatient. 2. The participant signs and dates a written, informed consent form and any required privacy authorization prior to the initiation of any study procedures. Exclusion Criteria: 1. The participant has any serious cardiac disease, serious cerebrovascular disorder, or any serious pancreatic or hematological disease.（e.g., subjects who require hospitalization or subjects who were hospitalized within 24 weeks prior to the commencement of the observation period) 2. The participant is considered ineligible for the study for any other reason by the investigator or subinvestigator.