R Ghosh1, D Roy2, S Das3, J Benito-León4. 1. Department of General Medicine, Burdwan Medical College & Hospital, Burdwan, West Bengal, India. 2. Department of Biochemistry, All India Institute of Medical Sciences (AIIMS), Jodhpur, Rajasthan, India; Indian Institute of Technology (IIT), Madras, Tamil Nadu, India. 3. Department of Neuromedicine, Bangur Institute of Neurosciences, Institute of Post Graduate Medical Education and Research & SSKM Hospital, Kolkata, West Bengal, India. 4. 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, Complutense University, Madrid, Spain. Electronic address: jbenitol67@gmail.com.