Khanna AK, Saager L, Bergese SD, Jungquist CR, Morimatsu H, Uezono S, Ti LK, Soto R, Jiang W, Buhre W. Opioid-induced respiratory depression increases hospital costs and length of stay in patients recovering on the general care floor. BMC Anesthesiol. 2021 Mar 20; 21(1):88.