Figure 1. Publications output over 20 years.
(A) Annual publication number of research of CRS and NPs. (B) The number and proportion of publications in different research categories.
Figure 2. The collaborative networks between different units.
Inter-country cooperation network. The color represents the cluster. (B)
Geographical distribution of inter-country cooperation. Each connecting line represents 5 collaborative publications between two countries. The color represents the number of publications. (C) Inter-institutional cooperation network. The color represents the average year of publication. (D) Author collaboration network.