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Table 2 Patent statistics for technology assessment in previous studies

From: Assessment of technological level of stem cell research using principal component analysis

Previous studies	Patent statistics
Previous studies	Number of patents	Patent impact index	Cited-patent life time
Huang et al. (2003)	0	0
Ernst (2003)	0
CHI Research Inc. (2005)	0	0
Chia (2004)	0	0
Yoo et al. (2006)			0
Cho et al. (2013)	0	0
Cho and Park (2015)	0

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