Mohammed Farhan Ansari and Shweta Prasad have contributed equally to this work.

Department of Neurology, National Institute of Mental Health and Neurosciences (NIMHANS), Hosur Road, Bangalore, Karnataka, 560029, India

Mohammed Farhan Ansari, Sujas Bhardwaj, Nitish Kamble, K. Rakesh, Vikram V. Holla, Ravi Yadav, Rohan R. Mahale & Pramod Kumar Pal

Department of Neuroimaging and Interventional Radiology, National Institute of Mental Health and Neurosciences (NIMHANS), Hosur Road, Bangalore, Karnataka, 560029, India

Shweta Prasad & Jitender Saini

MFA: research project: conception, organization, execution and statistical analysis: design, execution, manuscript preparation: writing of the first draft. SP: research project: conception, organization, execution and statistical analysis: design, execution, manuscript preparation: review and critique. SB: research project: organization, execution, statistical analysis, execution, review and critique. NK: research project, organization, execution and statistical analysis: design, execution, manuscript preparation: review and critique. RK: research project: execution, statistical analysis: review and critique and manuscript preparation: review and critique. VVH: research project: execution, statistical analysis: review and critique and manuscript preparation: review and critique. RM: research project: conception, statistical analysis: design, review and critique, manuscript preparation: review and critique. RY: research project: organization, execution, statistical analysis: review and critique, manuscript preparation: review and critique. JS: research project: conception, execution, statistical analysis: design, review and critique, manuscript preparation: review and critique. PKP: research project: conception, organization, statistical analysis: design, review and critique, manuscript preparation: review and critique.

Correspondence to Pramod Kumar Pal.