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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Map showing the countries in which the oleaster trees (Olea europaea L. subsp. europaea var. sylvestris) used in the studies cited in this review were collected. The number of studies performed in each country is indicated.