DOI:
10.1055/s-00000009
American Journal of Perinatology
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References
Olofsson C, Ekblom A, Ekman-Ordeberg G, Hjelm A, Irestedt L.
Lack of analgesic effect of systemically administered morphine or pethidine on labour pain.
Br J Obstet Gynaecol 1996;
103 (10) 968-972
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