Expression of Concern: Abstracts - 2020 - Basic & ...
1 China National Institute of Standardization, Beijing, China; 2 Shaanxi Standardization Institute, Shaanxi, China Background: In recent years, the prevalence of low vision among adolescents in China is increasing, and now, the number of patients ranks first in the world. However, at present, there is a lack of overall research on standards for ...
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