Additional file 3: of Current globalization of drug interventional clinical trials: characteristics and associated factors, 2011–2013

Number values of associated factors (explanatory variables) considered in regression analysis on clinical trial site distribution. (DOCX 16 kb

Additional file 2: of Current globalization of drug interventional clinical trials: characteristics and associated factors, 2011–2013

The geographical distribution and characteristics of drug interventional clinical trial in the top 30 countries worldwide, 2011–2013. (DOCX 29 kb