Department of Neurology, Maharajgunj Medical Campus, Tribhuvan University Institute of Medicine, Maharajgunj, Kathmandu, Nepal. Electronic address: bikram_gajurel@iom.edu.np. Department of Internal Medicine, Maharajgunj Medical Campus, Tribhuvan University Institute of Medicine, Maharajgunj, Kathmandu, Nepal. Electronic address: gauravnepal@iom.edu.np. Department of Internal Medicine, Maharajgunj Medical Campus, Tribhuvan University Institute of Medicine, Maharajgunj, Kathmandu, Nepal. Electronic address: kharel_sanjeev@iom.edu.np. Department of Internal Medicine, Maharajgunj Medical Campus, Tribhuvan University Institute of Medicine, Maharajgunj, Kathmandu, Nepal. Electronic address: jkyadav22@iom.edu.np. Department of Internal Medicine, Maharajgunj Medical Campus, Tribhuvan University Institute of Medicine, Maharajgunj, Kathmandu, Nepal. Electronic address: skyadav136@iom.edu.np. Department of Internal Medicine, National University Hospital, Singapore. Electronic address: yow_ks@yahoo.com.sg. Department of Neurology, Medical University of Vienna, Vienna, Austria. Electronic address: stellagoeschl@outlook.com. Department of Internal Medicine, Maharajgunj Medical Campus, Tribhuvan University Institute of Medicine, Maharajgunj, Kathmandu, Nepal. Electronic address: sahiliom88888@gmail.com.