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. 2021 Jan 13;2021:8823383. doi: 10.1155/2021/8823383

Figure 2.

Figure 2

Number of publications in pNE and related subfields. Results of a PubMed literature search using relevant keywords for pNE and pNE subtopics. Publications till 11/2020 are considered in this query. Based on the number of articles, some aspects, such as epidemiology, accessibility and diversion strategies, pharmacology, and ethics, seem to attract specific scientific attention (highlighted in yellow).