Table 9.

Top 20 of subject attribute.

No.	Frequency	Centrality	Subject
1	684	0.18	Gastroenterology and hepatology
2	303	0.07	General and internal medicine
3	266	0.17	Medicine, general and internal
4	198	0.46	Research and experimental medicine
5	198	0.01	Medicine, research, and experimental
6	153	0.14	surgery
7	139	0.57	Pharmacology and pharmacy
8	90	0.12	Biochemistry and molecular biology
9	74	0.1	Cell biology
10	67	0.13	Oncology
11	65	0.07	Science and technology – other topics
12	62	0.01	Multidisciplinary sciences
13	60	0.12	Pediatrics
14	57	0.06	Immunology
15	56	0.12	Radiology, nuclear medicine, and medical imaging
16	47	0.13	Nutrition and dietetics
17	45	0.06	Endocrinology and metabolism
18	43	0.01	Emergency medicine
19	37	0.08	Pathology
20	37	0.13	Physiology