Research progress and challenges in stem cell therapy for diabetic foot: Bibliometric analysis and perspectives

Table 8 Top 20 keywords based on their frequency

No.	Occurrence frequency	Centrality	Year	Keywords	No.	Occurrence frequency	Centrality	Year	Keywords
1	253	0.51	2004	Diabetic foot ulcers	11	47	0.04	2007	Expression
2	119	0.04	2011	Wound healing	12	44	0.12	2005	Chronic wounds
3	98	0.05	2013	Mesenchymal stem cells	13	40	0.02	2013	Stem cells
4	78	0.04	2011	Stem cells	14	38	0.08	2004	Diabetes mellitus
5	75	0.13	2006	Angiogenesis	15	37	0.03	2005	Skin
6	71	0.06	2005	Diabetic foot	16	34	0.04	2012	Critical limb ischemia
7	57	0.06	2011	Therapy	17	33	0.03	2011	In vitro
8	55	0.09	2004	Management	18	32	0.02	2011	Stromal cells
9	51	0.12	2006	Endothelial progenitor cells	19	31	0.03	2014	Proliferation
10	48	0.05	2004	Differentiation	20	30	0.02	2011	Foot ulcers