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. 2020 Feb 7;11:37. doi: 10.3389/fphar.2020.00037

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Copyright © 2020 Yeung, Tzvetkov, Balacheva, Georgieva, Gan, Jozwik, Pyzel, Horbańczuk, Novellino, Durazzo, Lucarini, Camilli, Souto, Atanasov and Santini

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Bubble map visualizing words from titles and abstracts of the 10,742 lignan publications. VOSviewer software was used to evaluate the recurring terms. Only the 311 terms that appeared in at least 1% (n = 108) of the publications were analyzed and visualized. The size of a bubble represents the frequency of appearance of a term (multiple appearances within one publication were treated as one appearance). Two bubbles are positioned more closely to each other if the terms co-appeared more often. The color represents the averaged citations per publication.