[1] Sree Chitra Tirunal Inst Med Sci & Technol, Dept Neurol, Trivandrum 695011, Kerala, India
[2] Sree Chitra Tirunal Inst Med Sci & Technol, Dept Imaging Sci & Intervent Radiol, Trivandrum 695011, Kerala, India
[3] Sree Chitra Tirunal Inst Med Sci & Technol, Dept Pathol, Trivandrum 695011, Kerala, India