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Table 2

Geographic distribution of literature.

Author affiliation Number of publications Percentage
USA 32 31.7
China 30 29.6
Japan 16 15.7
Canada 4 4.0
UK 4 4.0
India 3 3.0
Germany 2 2.0
Romania 2 2.0
Taiwan 2 2.0
South Corea 2 2.0
Australia 1 1.0
Chile 1 1.0
Italy 1 1.0
Poland 1 1.0

In case of multi-authored publications affiliation of first author was considered.

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