[1] Nikolova T, Bayev O, Nikolova N, Di Renzo GC. Evaluation of a novel placental alpha microglobulin-1 (PAMG-1) test to predict spontaneous preterm delivery. J Perinat Med. 2014 Jul;42(4):473-7.

[2] ACOG Committee on Practice Bulletins-Obstetrics. ACOG Practice Bulletin no. 127: Management of Preterm Labor. Clinical management guidelines for obstetrician-gynecologists. Obstet Gynecol 2012; 119:1308-1316.

[3] Institute of Medicine. Preterm birth: causes, consequences, and prevention. Washington, DC: National Academies Press; 2007.

[4] Peaceman AM, Andrews WW, Thorp JM, Cliver SP, Lukes A, Iams JD, Coultrip L, Eriksen N, Holbrook RH, Elliott J, Ingardia C, Pietrantoni M. Fetal fibronectin as a predictor of preterm birth in patients with symptoms: a multicenter trial. Am J Obstet Gynecol. 1997 Jul;177(1):13-8.

[5] Sanchez-Ramos et al. Obstet Gynecol 2009; 114: 631-40.