Pratley, Richard E, et al. “Oral Semaglutide Reduces HbA and Body Weight in Patients With Type 2 Diabetes Regardless of Background Glucose-Lowering Medication: PIONEER Subgroup Analyses”. 2021. Diabetes Therapy : Research, Treatment and Education of Diabetes and Related Disorders, vol. 12, no. 4, 2021, pp. 1099–1116.