Mathematical modeling of COVID-19 and chronic kidney disease co-infection with vaccination and optimal control: a bifurcation and sensitivity analysis approach. - Rao, Mallela Ankamma; Jaradat, Emad K; Devi, Medisetty Padma; Dhandapani, Prasantha Bharathi; Martin-Barreiro, Carlos; Al-Hmoud, Mohannad (AIMS Mathematics, 2026)