0.35 Frank R. Lichtenberg Tomas J. Philipson, The Dual Effects of Intellectual Property Regulations: Within‐ and Between‐Patent Competition in the US Pharmaceuticals Industry, Journal of Law and Economics, 2002.

{ drug drugs pharmaceutical products }	0.35
{ table number data percent }	0.17
{ patent patents invention royalty }	0.12
{ variable variables results significant }	0.05

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