DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Khooshideh M, Shahriari A.
A comparison of tramadol and pethidine analgesia on the duration of labour: a randomised clinical trial.
Aust N Z J Obstet Gynaecol 2009;
49 (01) 59-63
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