Table 3 The core-keywords in International nursing research

Rank		Frequency		Degree centrality
1	Nurse	403	Nurse	0.529
2	Moral distress	342	Patient	0.414
3	Patient	202	Moral distress	0.371
4	Care	198	Care	0.343
5	Family	86	Family	0.229
6	Intensive care unit	85	Intensive care unit	0.229
7	Ethical issues	85	Healthcare professionals	0.143
8	Healthcare professionals	82	Palliative care	0.143
9	Clinical nursing practice	61	Burnout	0.129
10	Experience	58	Decision making	0.129
11	Distress	56	Ethical issues	0.129
12	Palliative care	51	Child	0.114
13	Burnout	48	Dementia patient	0.114
14	End-of-life care	47	Experience	0.114
15	Doctor	46	Management	0.114
16	Person	43	Person	0.114
17	Decision making	43	End-of-life care	0.100
18	Evidence	41	Life	0.100
19	Ethical dilemma	39	Staff	0.100
20	Outcome	37	Cancer patient	0.086