1. Department of Neurology; National Neuroscience Centre; Kolkata India
2. Department of Statistics; University of Calcutta Ballygunj Campus; Kolkata India
3. Department of Neurology; Bangur Institute of Neurosciences; Kolkata India
4. Department of Psychiatry; Medical College Kolkata; Kolkata India
5. Department of Neurology; R. G. Kar Medical College; Kolkata India
6. Department of Pharmacology; Institute of Post Graduate Medical Education and Research (IPGME&R); Kolkata India
7. Sampling Unit, Department of Applied Statistics; Indian Statistical Institute; Kolkata India
8. Department of psychiatry; ICARE Institute of Medical Sciences & Research; Haldia West Bengal India