Shahid, A.D. et al. 2017. The Early Prognosis Value of Activin A in Premature Infants’ Brain Injury. Journal of Advanced Research in Medical and Health Science (ISSN 2208-2425). 3, 3 (Mar. 2017), 06–10. DOI:https://doi.org/10.53555/nnmhs.v3i3.622.