We thank David M. Schultz for his comments on an earlier version of the manuscript. We also thank Claudiu Botezat and Cristian Calomfirescu from the Romanian National Center for Statistics and Informatics in Public Health and Dan Mihai Marius from the Romanian National Institute of Public Health for providing the data on lightning-related fatalities in Romania. We thank Laura Ichim from the Romanian National Institute of Statistics for providing information about the population dataset and Col. Daniel Marian Dragne for providing information about the activities of the Romanian General Inspectorate for Emergency Situations. We thank Ronald L. Holle and Vaisala for the lightning data used in Fig. 2, Alexandre Badoux from the Swiss Federal Research Institute for providing data on lightning fatalities in Switzerland, and Tudor Palela for providing the map showed in Fig. 1a. Partial funding for Antonescu was provided by the Natural Environment Research Council through Grant NE/N003918/1.
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