Shahid, Ahmad Daniyal, et al. “The Early Prognosis Value of Activin A in Premature Infants’ Brain Injury”. Journal of Advanced Research in Medical and Health Science (ISSN 2208-2425), vol. 3, no. 3, Mar. 2017, pp. 06-10, https://doi.org/10.53555/nnmhs.v3i3.622.