Stochastic global exponential stability of disease-free equilibrium of HIV/AIDS model H. El-Metwally, M. A. Sohaly and I. M. Elbaz Eur. Phys. J. Plus, 135 10 (2020) 840 Published online: 17 October 2020 DOI: 10.1140/epjp/s13360-020-00856-0