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		Ara, K., 		Bahrami, M., 		Bahrami, E., 		Bahrami, S., 		Bahrami, M., 		Moosazadeh, M., & 		Barati, O.
2016 Apr 26.  Progesterone Therapy for the Prevention of Preterm Labor in Women with Single Risk-factor: A Systematic Review and Meta-analysis. BALI MEDICAL JOURNAL. [Online] 5:1