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Bai, Ya-Jie; Dai, Ru-Jun . (2018). Serum levels of vitamin A and 25-hydroxyvitamin D3 (25OHD3) as reflectors of pulmonary function and quality of life (QOL) in children with stable asthma. Medicine, 97(7), e9830–. doi:10.1097/MD.0000000000009830 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research