1\begin{tabular}{lrrr}2\toprule3Country & stage-1 included records & extracted studies & usable estimates \\4\midrule5United States & 450 & 54 & 2,558 \\6China & 377 & 25 & 691 \\7unknown & 196 & 0 & 0 \\8South Korea & 130 & 3 & 55 \\9United Kingdom & 67 & 12 & 458 \\10Australia & 60 & 5 & 9 \\11USA & 54 & 0 & 0 \\12Indonesia & 48 & 3 & 38 \\13Turkey & 47 & 7 & 77 \\14France & 44 & 2 & 128 \\15Italy & 42 & 13 & 232 \\16Brazil & 42 & 2 & 7 \\17Poland & 41 & 7 & 341 \\18Malaysia & 39 & 5 & 41 \\19Canada & 38 & 3 & 60 \\20Germany & 38 & 7 & 137 \\21Taiwan & 36 & 6 & 186 \\22Hong Kong & 32 & 4 & 0 \\23Spain & 32 & 8 & 43 \\24Sweden & 27 & 3 & 110 \\25Nigeria & 27 & 3 & 87 \\26New Zealand & 25 & 0 & 0 \\27Netherlands & 25 & 5 & 119 \\28Japan & 21 & 3 & 105 \\29Colombia & 20 & 3 & 32 \\30\bottomrule31\end{tabular}32