In the file that you will use, please make sure that all the columns have names and there are not empty column names in the 1st row.
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Tsivgoulis G, Kargiotis O, Katsanos AH, et al. Incidence, characteristics and outcomes in patients with embolic stroke of undeterminedsource: a population-based study. J Neurol Sci 2019;401:5-11.