Global trends in research of immune cells associated with hypertensive disorders of pregnancy: A 20-year bibliometric analyses (from 2001 to 2021).

Annual growth trend in publications and citations There was an increasing trend in the number of publications and citations per year ( Figure 2 ).

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Mortality and morbidity are on a decreasing trend in most countries/regions, with a 30.05% of reduction in mortality in 2019 compared to 1990 ( 19 ).Despite the current decrease in mortality, there is no effective treatment to improve maternal and infant outcomes, and thus, it necessitates a deep insight into into the pathogenesis of the disease in order to develop more effective treatment.

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