Efficacy and Treatment Satisfaction of Once-daily Insulin Glargine Plus One or Two Oral Antidiabetic Agents Versus Continuing Premixed Human Insulin in Patients with Type 2 Diabetes Previously on Long-term Conventional Insulin Therapy: The SWITCH Pilot Study - Schiel, R; Müller, U A (Experimental and Clinical Endocrinology & Diabetes, 2008)