Impact of renin–angiotensin–aldosterone system inhibition on mortality in critically ill COVID-19 patients with pre-existing hypertension: a prospective cohort study by Sato, K, White, N, Fanning, JP, Obonyo, N, Yamashita, MH, Appadurai, V, Ciullo, A, May, M, Worku, ET, Helms, L, Ohshimo, S, Juzar, DA, Suen, JY, Bassi, GL, Fraser, JF, Arora, RC, Nichol, A