Current globalization of drug interventional clinical trials: characteristics and associated factors, 2011–2013 oleh Sohyun Jeong, Minji Sohn, Jae Hyun Kim, Minoh Ko, Hee-won Seo, Yun-Kyoung Song, Boyoon Choi, Nayoung Han, Han-Sung Na, Jong Gu Lee, In-Wha Kim, Jung Mi Oh, Euni Lee