\begin{tabular}{lrrr}
\toprule
Country & stage-1 included records & extracted studies & usable estimates \\
\midrule
United States & 450 & 54 & 2,558 \\
China & 377 & 25 & 691 \\
unknown & 196 & 0 & 0 \\
South Korea & 130 & 3 & 55 \\
United Kingdom & 67 & 12 & 458 \\
Australia & 60 & 5 & 9 \\
USA & 54 & 0 & 0 \\
Indonesia & 48 & 3 & 38 \\
Turkey & 47 & 7 & 77 \\
France & 44 & 2 & 128 \\
Italy & 42 & 13 & 232 \\
Brazil & 42 & 2 & 7 \\
Poland & 41 & 7 & 341 \\
Malaysia & 39 & 5 & 41 \\
Canada & 38 & 3 & 60 \\
Germany & 38 & 7 & 137 \\
Taiwan & 36 & 6 & 186 \\
Hong Kong & 32 & 4 & 0 \\
Spain & 32 & 8 & 43 \\
Sweden & 27 & 3 & 110 \\
Nigeria & 27 & 3 & 87 \\
New Zealand & 25 & 0 & 0 \\
Netherlands & 25 & 5 & 119 \\
Japan & 21 & 3 & 105 \\
Colombia & 20 & 3 & 32 \\
\bottomrule
\end{tabular}