Since this study began in July 2024, the number of publications retrieved in that year showed a decreasing trend compared to previous years. 3.2 Analysis of countries/regions A total of 17 countries and regions have published articles in the field of HRTV, and the top 5 countries with the most publications are shown in Table 1 .
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The United States is the leader in HRTV research, and the cooperation and exchange between countries and the publication of research results have shown an increasing trend.