Year

Frequency

Centrality

Keyword

Year

Frequency

Centrality

Keyword

2009

697

0.24

Internet

2010

175

0.26

Prevalence

2009

660

0.54

Care

2010

108

0.17

Risk

2009

649

0.50

Health

2011

221

0.66

Attitude

2009

395

0.50

Impact

2016

131

0.01

Knowledge

2009

291

0.03

Education

2019

129

0.39

Mental health

2009

271

0.00

Information

2019

43

0.38

Medical student

2009

237

0.66

Health care

2020

173

0.00

Covid-19

2009

196

0.09

Physician

2020

88

0.13

Anxiety

2009

199

0.09

Quality

2020

87

0.26

Depression

2009

104

0.03

Medical education