The term	Occurrences	Relevance score
Development	7	0.4982
Identification	6	0.3322
Infected patient	6	0.6354
CT scan	6	0.9406
Application	5	0.5307
Chest	5	0.6295
Availability	5	0.7282
Challenge	4	0.359
Effectiveness	4	0.4265
Clinician	4	0.5798
Hospital	4	0.6364
China	4	0.7859
Computed tomography	4	0.8326
F1 score	4	0.9414
Country	4	0.966
CNN model	4	1.0171
CXR	4	1.2212
Experiment	4	4.0463
Average accuracy	3	0.5206
Auc	3	0.6694
Combination	3	0.7014
Artificial intelligence	3	0.779
Curve	3	1.2174
CXR image	3	1.3426
Clinical trial	3	1.8487
Coronavirus pneumonia	3	2.8663
COVID-19	3	5.3131
Abnormality	3	0.7001
36 large number	3	1.1211
37 layer	5	1.0512
38 lung	7	0.2469
39 novel coronavirus disease	4	1.0644
40 order	5	0.5125
41 outbreak	6	0.4311
42 pandemic	11	0.1988
43 person	5	0.8363
44 pneumonia patient	3	1.3492
45 pre	5	0.7848
46 precision	3	1.7955
47 problem	5	1.0945
48 proposed approach	3	1.239
49 research	6	0.7289
50 researcher	3	0.8186
51 resource	4	0.7872
52 rt pcr	3	1.114
53 score	4	0.963
54 severity	3	0.9426
55 specificity	6	0.3328
56 spread	7	0.4935
57 step	5	1.4488
58 strength	3	0.8021
59 support vector machine	5	1.8943
60 svm	4	1.6393
61 testing	6	0.706
62 tomography	3	1.1936
63 tool	10	0.5454
64 transfer learning	5	0.8498
65 treatment	7	0.2921
66 validation	4	0.9968
67 virus	9	0.4709
68 world	6	0.5198
69 X ray dataset	4	1.3707