1. Vels Medical College and Hospital, Chennai, Tamil Nadu, India
2. Chettinad Hospital and Research Institute, Chennai, Tamil Nadu, India
3. Tirunelveli Medical College, Tirunelveli, Tamilnadu
4. King Salman Hospital, Riyadh, Saudi Arabia
5. Department of General Medicine, Mahatma Gandhi Medical College and Research Institute Pondicherry, Pondicherry, India