Demographic background: date of birth, race, sex, disease duration of type 2 diabetes mellitus, drug and therapy used for treatment of type 2 diabetes mellitus within 3 months prior to the study procedure, complications / medical history, concomitant drug / therapy, drinking / smoking status, height / weight / BMI Examination item: physical examination, measurement of body fluid volume (by impedance method), clinical laboratory tests, vital signs (blood pressure, pulse rate, body temperature) <Statistical Analysis>