Fig. 4From: The evolution and future of diabetic kidney disease research: a bibliometric analysisDistributions of the subcategories, topics and time periods. The distributions of the 100 articles are shown in the figure (a). The distributions of clinical studies (b) and experimental studies (c) in different time periods are shown as pie charts. The distributions of topics in clinical (d) and experimental studies (e) are showed as Nightingale rose chartsBack to article page