Romero R, Espinoza J, Erez O, Hassan S. The role of cervical cerclage in obstetric practice: can the patient who could benefit from this procedure be identified?. „American journal of obstetrics and gynecology”. 1 (194), s. 1–9, styczeń 2006. DOI: 10.1016/j.ajog.2005.12.002. PMID: 16389003.
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Romero R, Espinoza J, Erez O, Hassan S. The role of cervical cerclage in obstetric practice: can the patient who could benefit from this procedure be identified?. „American journal of obstetrics and gynecology”. 1 (194), s. 1–9, styczeń 2006. DOI: 10.1016/j.ajog.2005.12.002. PMID: 16389003.