2. M. L. Li,
“Clinical observation of berberine combined with metformin on treating type 2 diabetes,”
Hubei Journal of Traditional Chinese Medicine, vol. 30, no. 2, pp. 34–35, 2008.


3. L. Qiu, G. H. Sheng, Y. Qu, and S. Y.Wang,
“Clinical efficiency of berberine hydrochloride in type 2 diabetes mellitus and its effect on serum adiponectin and insulin resistance factor levels”
Shanghai Medical Journal, vol. 34, no. 9, pp. 679–681, 2011

4. Z. X. Sheng and D. H. Xie,
“Therapeutic effect of berberine on the levels of inflammatory factors in type 2 diabetic patients,”
New Medicine, vol. 41, no. 3, pp. 177–180, 2010

I couldn't find any of them, but I'll bump your post. Maybe someone else can.