Clinical manifestations and treatment outcomes among hospitalised COVID-19 patients in tertiary hospitals in Tanzania, 2021–2022: a retrospective cohort study oleh Abel Makubi, Candida Moshiro, Elisha Fred Otieno Osati, Grace Ambrose Shayo, Raphael Z Sangeda, Tumaini Joseph Nagu, Naveeda Adams, Athumani Ramadhani, Bahati Wajanga, Albert Muniko, Jeremiah Seni, Mary A Nicholaus, Gervas Nyaisonga, Christian Mbije, John Robson Meda, Denis Rainer, Martha Elisande Nkya, Paulo Mhame, Lucy Samwel, Liggyle Vumilia, Seif Shekalaghe, Kajiru G Kilonzo