Anggraini, A. D., Budi Prasetyo, and Rachmah Indawati. “Effect of Covid-19 on Premature Birth : A Systematic Review and Meta-Analysis”. Science Midwifery, Vol. 10, no. 5, Nov. 2022, pp. 3535-43, doi:10.35335/midwifery.v10i5.796.