1 Department of Anaesthesiology, Critical Care Unit, Tribhuvan University Teaching Hospital, Maharajgunj, Kathmandu, Nepal. gentlesunder@hotmail.com.
2 Clinic of Anesthesiology and Intensive Care, Kepler University Clinic, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040, Linz, Austria.
3 Divisions of Critical Care and Pulmonology, Department of Medicine, Charlotte Maxeke Johannesburg Academic Hospital and Faculty of Health Sciences University of the Witwatersrand, Johannesburg, South Africa.