Kar S, Wong M, Rogozinska E, Thangaratinam S. Effects of omega-3 fatty acids in prevention of early preterm delivery: a systematic review and meta-analysis of randomized studies. Eur J Obstet Gynecol Reprod Biol. 2016;198:40‐46.
 Preterm labor, Mayo Clinic. Available from: https://www.mayoclinic.org/diseases-conditions/preterm-labor/symptoms-causes/syc-20376842
 Preterm labor and birth: condition information., Euncie Kennedy Shriver National Institute of Child Health and Human Development, NIH. Available from: https://www.nichd.nih.gov/health/topics/preterm/conditioninfo/default