Table 6.

Top 20 keywords related to CVDs and COVID-19 research.

Rank	Keyword	Frequency	Degree	BC	Rank	Keyword	Frequency	Degree	BC
1	Cardiovascular disease	441	31	0.33	11	Clinical characteristics	97	23	0.03
2	COVID-19	253	43	0.08	12	Receptor	88	23	0.06
3	ACE2	192	42	0.09	13	Heart failure	82	17	0.21
4	Mortality	122	17	0.09	14	Expression	80	23	0.16
5	Risk	118	18	0.2	15	Inflammation	74	19	0.15
6	Coronavirus	111	26	0.08	16	Myocardial infarction	72	14	0.08
7	Infection	110	23	0.07	17	SARS coronavirus	71	25	0.07
8	Wuhan	108	17	0.02	18	Acute respiratory syndrome	56	20	0.04
9	Pneumonia	106	19	0.04	19	Management	55	8	0.03
10	Risk factor	102	7	0.01	20	Oxidative stress	48	10	0.03

BC, Betweenness Centrality.