As reported in Figure 2 A, the number of scientific reports was unevenly distributed in the study period (i.e., from 1990 to 2020), although a positive trend was observed.
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Natural Products against Sand Fly Vectors of Leishmaniosis: A Systematic Review.
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The sentences
However, it should be noted that in general, the research focused on the development of botanical products against sand flies just started in the recent years [ 54 , 55 ], and as herein reported, an increasing trend in the number of publications has been observed.