[Retracted] A Comparative Study of Endometriosis and Normal Endometrium Based on Ultrasound Observation

Table 2

China’s ultrasound contrast agent market segmentation product demand quantity.

	2015	2016	2017	2018	2019	2020
Domestic demand	0.26	0.52	0.93	1.27	2.50	3.64
Foreign investment and imports	33.01	43.25	58.49	76.13	111.73	156.24
Domestic products	0.78%	1.19%	1.57%	1.64%	2.19%	2.30%
Foreign investment and imports	99.22%	98.81%	98.43%	98.36%	97.81%	9.72%