Farid, L.N. et al. 2021. Effect of positive end-expiratory pressure value on change in end-tidal carbon dioxide as a predictor of fluid responsiveness in Patients Undergoing Passive Leg Raising Maneuver. Qanun Medika - Medical Journal Faculty of Medicine Muhammadiyah Surabaya. 5, 2 (Jul. 2021). DOI:https://doi.org/10.30651/jqm.v5i2.5458.