1 Department of General Medicine, Burdwan Medical College, Burdwan, West Bengal, India.
2 Department of Neurology, University Hospital "12 de Octubre", Madrid, Spain.
3 Department of Biochemistry, All India Institute of Medical Sciences (AIIMS), Jodhpur, Rajasthan, India; Indian Institute of Technology (IIT), Madras, Tamil Nadu, India; School of Humanities, Indira Gandhi National Open University, New Delhi, India.
4 Department of Neuromedicine, Bangur Institute of Neurosciences, Institute of Post Graduate Medical Education and Research & SSKM Hospital, Kolkata, West Bengal, India.
5 Department of Neurology, University Hospital "12 de Octubre", Madrid, Spain; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain; Department of Medicine, Universidad Complutense, Madrid, Spain. Electronic address: [email protected].