Combined Anti-diabetic Effects of Extracts of Artemisia annua var. chiknensis (CBGE/CHNA/09/LTNGS/G) and Each of Three Other Plants (Momordica charantia Linn. Vernonia amygdalina Del. and Aegle marmelos Correa) Traditionally Used in Nigeria for the Treatment of Diabetes - Ogbonna, C. I. C.; Ogbonna, A. I. (Advances in Applied Science and Technology Vol. 6, 2019)