1 Department of Anesthesiology, Mahatma Gandhi Medical College and Research Institute, Sri Balaji Vidyapeeth (Deemed to be University), Pondicherry, India.
2 Department of Anaesthesiology and Critical Care, Sri Venkateswara Institute of Medical Science, Tirupati, Andhra Pradesh, India.
3 Department of Anesthesia and Intensive Care, Postgraduate Institute of Medical Education and Research, Chandigarh, India.