1 Division of Cardiothoracic and Vascular Anesthesia, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, India.
2 Division of Cardiothoracic and Vascular Anesthesia, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, India; Department of Anesthesia, Christian Medical College, Vellore, India.