[1] Vogel JP, Chawanpaiboon S, Moller AB, et al. The global epidemiology of preterm birth. Best Pract Res Clin Obstet Gynaecol, 2018; 52, 3−12. doi:  10.1016/j.bpobgyn.2018.04.003
[2] Greer C, Troughton RW, Adamson PD, et al. Preterm birth and cardiac function in adulthood. Heart, 2022; 108, 172−7. doi:  10.1136/heartjnl-2020-318241
[3] Goldenberg RL, Culhane JF, Iams JD, et al. Epidemiology and causes of preterm birth. Lancet, 2008; 371, 75−84. doi:  10.1016/S0140-6736(08)60074-4
[4] Fell DB, Dimanlig-Cruz S, Regan AK, et al. Risk of preterm birth, small for gestational age at birth, and stillbirth after covid-19 vaccination during pregnancy: population based retrospective cohort study. BMJ, 2022; 378, e071416.
[5] Annesi I, Moreau T, Lellouch J. Efficiency of the logistic regression and cox proportional hazards models in longitudinal studies. Stat Med, 1989; 8, 1515−21. doi:  10.1002/sim.4780081211
[6] Gong YX, Sun PP, Fu XL, et al. The type of previous abortion modifies the association between air pollution and the risk of preterm birth. Environ Res, 2022; 212, 113166. doi:  10.1016/j.envres.2022.113166
[7] Stieb DM, Lavigne E, Chen L, et al. Air pollution in the week prior to delivery and preterm birth in 24 Canadian cities: a time to event analysis. Environ Health, 2019; 18, 1. doi:  10.1186/s12940-018-0440-8
[8] Zhou GY, Wu JJ, Yang M, et al. Prenatal exposure to air pollution and the risk of preterm birth in rural population of Henan Province. Chemosphere, 2022; 286, 131833. doi:  10.1016/j.chemosphere.2021.131833
[9] Onoda A, Takeda K, Umezawa M. Dose-dependent induction of astrocyte activation and reactive astrogliosis in mouse brain following maternal exposure to carbon black nanoparticle. Part Fibre Toxicol, 2017; 14, 4. doi:  10.1186/s12989-017-0184-6
[10] Vadillo-Ortega F, Osornio-Vargas A, Buxton MA, et al. Air pollution, inflammation and preterm birth: a potential mechanistic link. Med Hypotheses, 2014; 82, 219−24. doi:  10.1016/j.mehy.2013.11.042
[11] Rappazzo KM, Nichols JL, Rice RB, et al. Ozone exposure during early pregnancy and preterm birth: a systematic review and meta-analysis. Environ Res, 2021; 198, 111317. doi:  10.1016/j.envres.2021.111317
[12] Baqui AH, Lee ACC, Koffi AK, et al. Prevalence of and risk factors for abnormal vaginal flora and its association with adverse pregnancy outcomes in a rural district in north-east Bangladesh. Acta Obstet Gynecol Scand, 2019; 98, 309−19. doi:  10.1111/aogs.13492