Table 2 The core-keywords in National nursing research

Rank		Frequency		Degree centrality
1	Moral distress	171	Nurse	0.727
2	Nurse	147	Moral distress	0.697
3	Moral sensitivity	50	Moral sensitivity	0.333
4	Long-term care facility	34	Education program	0.212
5	Hospital	30	End-of-life care	0.212
6	Experience	23	Experience	0.212
7	Care	23	Burnout	0.182
8	Program	21	Person-centered care	0.182
9	Education program	20	Care	0.152
10	Burnout	20	Job satisfaction	0.152
11	Clinical nursing practice	19	Empowerment program	0.121
12	Job satisfaction	18	Hospital	0.121
13	End-of-life care	18	Intensive care unit	0.121
14	Turnover intention	16	Long-term care facility	0.121
15	Intensive care unit	16	Nursing practice environment	0.121
16	Nursing student	14	Nursing student	0.121
17	Moral courage	13	Turnover intention	0.121
18	Ethical climate	12	Cancer patient	0.091
19	Empowerment program	10	Clinical nursing practice	0.091
20	Person-centered care	9	Emergency	0.091